<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7450</journal-id>
<journal-title><![CDATA[Revista Colombiana de Psiquiatría]]></journal-title>
<abbrev-journal-title><![CDATA[rev.colomb.psiquiatr.]]></abbrev-journal-title>
<issn>0034-7450</issn>
<publisher>
<publisher-name><![CDATA[Asociacion Colombiana de Psiquiatria.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74502009000300006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[¿Se relaciona la severidad del asma con el trastorno de ansiedad generalizada y el trastorno depresivo mayor? Estudio de casos y controles]]></article-title>
<article-title xml:lang="en"><![CDATA[Is Asthma Severity Related to Generalized Anxiety Disorder and Mayor Depressive Disorder? A Case-Control Study]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meneses-Jácome]]></surname>
<given-names><![CDATA[Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prada-Uribe]]></surname>
<given-names><![CDATA[Diana María Catalina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Acevedo]]></surname>
<given-names><![CDATA[Adriana Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Manchego-Báez]]></surname>
<given-names><![CDATA[Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Machado-Romero]]></surname>
<given-names><![CDATA[Carlos Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Martínez]]></surname>
<given-names><![CDATA[Luis Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campo-Arias]]></surname>
<given-names><![CDATA[Adalberto]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Militar  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Bucaramanga Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Autónoma de Bucaramanga Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Instituto de Investigación del Comportamiento Humano  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2009</year>
</pub-date>
<volume>38</volume>
<numero>3</numero>
<fpage>464</fpage>
<lpage>470</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74502009000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74502009000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74502009000300006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción: Alrededor del mundo, más de cien millones de personas presentan asma. En esta población se presenta una elevada prevalencia del episodio depresivo mayor (EDM) y trastorno de ansiedad generalizada (TAG); sin embargo, esta asociación no se ha estudiado en pacientes colombianos. Objetivo: Establecer si la severidad del asma se asocia a la presencia de trastorno depresivo mayor (TDM) y el TAG en adultos de la consulta externa de neumología de Bucaramanga, Colombia. Método: Se diseñó un estudio de casos (44 pacientes con asma severa) y controles (88 con asma leve) pareados por edad, sexo y nivel socioeconómico. Los diagnósticos de TDM y TAG actual se realizaron con la entrevista clínica estructurada para los trastornos del eje I (SCID-I) según el DSM-IV-TR. Resultados: Las prevalencias actuales de TDM fueron 27,2% y 29,5% en los pacientes con asma leve y en aquellos con asma severa, respectivamente (OR=1,12; IC95% 0,46-2,69). Las prevalencias actuales para TAG fueron 43,1% y 45,4% en los pacientes con asma leve y en aquellos con asma severa, respectivamente (OR=1,10; IC95% 0,49-2,44). Conclusión: No existe asociación entre TDM y TAG y el grado de severidad del asma en pacientes de Bucaramanga, Colombia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction: World-wide more than one hundred million people suffer from asthma. This population presents a high prevalence of major depressive disorder (MDD) and generalized anxiety disorder (GAD). However, this association has not been investigated IN Colombian asthma outpatients. Objective: To establish whether asthma severity is associated with MDD or GAD in adult asthma outpatients in Bucaramanga, Colombia. Method: A study on cases (44 patients with severe asthma) and controls (88 patients with mild asthma), matched according to age, sex and socioeconomic status, was designed. The current MDD and GAD diagnoses were made using the Structured Clinical Interview for D SM-IV Axis I Disorders-Clinical version (SCID-CV). Results: The current prevalencE of MDD WAS 27.2% and 29.5% in patients with mild asthma and patients with severe asthma, respectively (OR=1.12, 95% CI 0.46- 2.69). The prevalence of GAD was 43.1% and 45.4% in patients with mild asthma and patients with severe asthma, respectively (OR=1.10, 95% CI 0.49-2.44). Conclusion: There is no association between MMD and GAD and the degree of severity in asthma patients in Bucaramanga, Colombia.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[trastorno depresivo mayor]]></kwd>
<kwd lng="es"><![CDATA[trastornos de ansiedad]]></kwd>
<kwd lng="es"><![CDATA[pacientes ambulatorios]]></kwd>
<kwd lng="es"><![CDATA[asma]]></kwd>
<kwd lng="es"><![CDATA[estudios de casos y controles]]></kwd>
<kwd lng="en"><![CDATA[Major depressive disorder]]></kwd>
<kwd lng="en"><![CDATA[anxiety disorders]]></kwd>
<kwd lng="en"><![CDATA[outpatients]]></kwd>
<kwd lng="en"><![CDATA[asthma]]></kwd>
<kwd lng="en"><![CDATA[casecontrol studies]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">      <p align="center"><font size="4"><b>&iquest;Se relaciona la severidad del asma con    el   trastorno de ansiedad generalizada y el trastorno   depresivo mayor? Estudio de casos y controles*</b></font></p>     <p align="center"><font size="3"><b>Is Asthma Severity Related to Generalized   Anxiety Disorder and Mayor   Depressive Disorder? A Case-Control   Study</b></font></p>     <p>   <b>Claudia Meneses-J&aacute;come<sup>1</sup>, Diana Mar&iacute;a Catalina Prada-Uribe<sup>1</sup>, Adriana    Marcela Mart&iacute;nez-Acevedo<sup>1</sup>, Claudia Manchego-B&aacute;ez<sup>1</sup>, Carlos Alfonso    Machado-Romero<sup>2</sup>, Luis Alfonso D&iacute;az-Mart&iacute;nez<sup>3</sup>, Adalberto Campo-Arias<sup>4</sup></b></p>     <p>* Este trabajo se present&oacute; en 159th Annual Meeting de la American Psychiatric    Association,   Toronto, Canad&aacute;, 20 al 25 de mayo de 2006.</p>     <p>   <sup><b>1</b></sup>M&eacute;dica general. Hospital Militar. Bogot&aacute;, Colombia.</p>     <p>   <sup><b>2</b></sup>M&eacute;dico. Profesor asociado, Facultad de Medicina, Universidad Aut&oacute;noma    de Bucaramanga,   Bucaramanga, Colombia</p>     <p>   <sup><b>3</b></sup>M&eacute;dico, MSc. Profesor asociado, Facultad de Medicina, Grupo de Neuropsiquiatr&iacute;a,   Universidad Aut&oacute;noma de Bucaramanga, Bucaramanga, Colombia.</p>     <p>   <sup><b>4</b></sup>M&eacute;dico. Grupo de Investigaci&oacute;n del Comportamiento Humano. Director    de Investigaciones   del Instituto de Investigaci&oacute;n del Comportamiento Humano, Bogot&aacute;,    Colombia.</p>     <p>  Correspondencia   Adalberto Campo-Arias   Instituto de Investigaci&oacute;n del Comportamiento Humano   Carrera 7B No. 108A-90   Bogot&aacute;, Colombia   <a href="mailto:campoarias@comportamientohumano.org">campoarias@comportamientohumano.org</a></p>     ]]></body>
<body><![CDATA[<p>Recibido para evaluaci&oacute;n: 22 de abril del 2009 Aprobado para publicaci&oacute;n: 3 de julio del 2009</p><hr size="1">      <p>   <b>Resumen</b></p>     <p>   Introducci&oacute;n: Alrededor del mundo, m&aacute;s de cien millones de personas    presentan asma. En   esta poblaci&oacute;n se presenta una elevada prevalencia del episodio depresivo    mayor (EDM) y   trastorno de ansiedad generalizada (TAG); sin embargo, esta asociaci&oacute;n    no se ha estudiado en   pacientes colombianos. Objetivo: Establecer si la severidad del asma se asocia    a la presencia   de trastorno depresivo mayor (TDM) y el TAG en adultos de la consulta externa    de neumolog&iacute;a   de Bucaramanga, Colombia. M&eacute;todo: Se dise&ntilde;&oacute; un estudio    de casos (44 pacientes con asma   severa) y controles (88 con asma leve) pareados por edad, sexo y nivel socioecon&oacute;mico.    Los   diagn&oacute;sticos de TDM y TAG actual se realizaron con la entrevista cl&iacute;nica    estructurada para   los trastornos del eje I (SCID-I) seg&uacute;n el DSM-IV-TR. Resultados: Las    prevalencias actuales   de TDM fueron 27,2% y 29,5% en los pacientes con asma leve y en aquellos con    asma severa,   respectivamente (OR=1,12; IC95% 0,46-2,69). Las prevalencias actuales para TAG    fueron   43,1% y 45,4% en los pacientes con asma leve y en aquellos con asma severa,    respectivamente   (OR=1,10; IC95% 0,49-2,44). Conclusi&oacute;n: No existe asociaci&oacute;n entre    TDM y TAG y el   grado de severidad del asma en pacientes de Bucaramanga, Colombia.</p>     <p>   <b>Palabras clave</b>: trastorno depresivo mayor, trastornos de ansiedad, pacientes    ambulatorios,   asma, estudios de casos y controles. </p><hr size="1">      <p><b>Abstract</b></p>     <p>   Introduction: World-wide more than one   hundred million people suffer from asthma.   This population presents a high prevalence   of major depressive disorder (MDD) and   generalized   anxiety disorder (GAD). However,   this association has not been investigated IN   Colombian asthma outpatients. Objective: To   establish whether asthma severity is associated   with MDD or GAD in adult asthma   outpatients in Bucaramanga, Colombia.   Method: A study on cases (44 patients with   severe asthma) and controls (88 patients with   mild asthma), matched according to age, sex   and socioeconomic status, was designed.   The current MDD and GAD diagnoses were   made using the Structured Clinical Interview   for D SM-IV Axis I Disorders-Clinical version   (SCID-CV). Results: The current prevalencE   of MDD WAS 27.2% and 29.5% in patients   with mild asthma and patients with severe   asthma, respectively (OR=1.12, 95% CI 0.46-   2.69). The prevalence of GAD was 43.1% and   45.4% in patients with mild asthma and   patients with severe asthma, respectively   (OR=1.10, 95% CI 0.49-2.44). Conclusion:   There is no association between MMD and   GAD and the degree of severity in asthma   patients in Bucaramanga, Colombia.</p>     <p>   <b>Key words</b>: Major depressive disorder,   anxiety disorders, outpatients, asthma, casecontrol   studies.</p><hr size="1">      <p>   <b><font size="3">Introducci&oacute;n</font></b></p>     <p>   El asma es una enfermedad que   afecta a m&aacute;s de 100 millones de   personas en el contexto mundial y   que causa altas tasas de morbilidad   y mortalidad (1-5). Es una patolog&iacute;a   multifactorial que incluye factores   gen&eacute;ticos, infecciosos, inmunol&oacute;gicos,   psicol&oacute;gicos y ambientales   (6-9). En Colombia, la prevalencia   de asma puede oscilar entre 3,0%   y 10,7%, seg&uacute;n la forma de cuantificaci&oacute;n,   y en Bucaramanga puede   alcanzar 11,5% de la poblaci&oacute;n   (10,11).</p>     <p>   Por su parte, la prevalencia del   trastorno depresivo mayor (TDM) a   lo largo de la vida es cercana al 15%,   mientras para el trastorno de ansiedad   generaliza (TAG) puede alcanzar   aproximadamente el 20% (12). Es de   gran importancia tener en cuenta   que el TDM y el TAG son trastornos   mentales asociados a factores constitucionales   y medioambientales,   por lo que enfermedades de larga   evoluci&oacute;n o recidivantes, como el   asma, son factores importantes   para relacionar con su desencadenamiento   (13).</p>     ]]></body>
<body><![CDATA[<p>   El asma suele asociarse a trastornos   mentales como el episodio   depresivo mayor (EDM) y el TAG   (10,14), que pueden exacerbar los   s&iacute;ntomas bronquiales del asma y   viceversa. Entre tanto, la severidad   del asma puede incrementar los   s&iacute;ntomas de los trastornos mentales   ya mencionados (5,13,15-20).</p>     <p>   Seg&uacute;n diversos estudios, existe   alguna asociaci&oacute;n entre la morbilidad   psiqui&aacute;trica y la severidad del   asma, pero la mayor&iacute;a de ellos se   han realizado en ni&ntilde;os escolares y en   adolescentes (2,3,13,21-25). Es posible   que la prevalencia de trastornos   mentales sea mayor en los pacientes   que presentan s&iacute;ntomas o cuadros   de asma m&aacute;s cr&oacute;nicos; por ello es de gran importancia recordar    que la   coexistencia de un trastorno mental y   una enfermedad org&aacute;nica incrementa   los costos en cuanto atenci&oacute;n m&eacute;dica,   terap&eacute;utica del paciente, adem&aacute;s de   que disminuye la calidad de vida del   afectado (5). El objetivo del presente   estudio fue comparar la prevalencia   de TAG y EDM en pacientes con asma   severa y asma leve en Bucaramanga,   Colombia.</p>     <p>   <font size="3"><b>M&eacute;todo</b></font></p>     <p>   Se realiz&oacute; un estudio de casos y   controles pareado evaluado y aprobado   por el Comit&eacute; de &Eacute;tica de la   Universidad Aut&oacute;noma de Bucaramanga   y de diferentes instituciones   que aportaron pacientes a la investigaci&oacute;n.   Los participantes firmaron   un consentimiento informado, en   congruencia de las disposiciones   colombianas vigentes para la investigaci&oacute;n   en salud (26).</p>     <p>   En el programa Epi-Info 6.04c   se calcul&oacute; el tama&ntilde;o de muestra   con una relaci&oacute;n 1:2, una raz&oacute;n de   disparidad (OR) de 3,5, un error alfa   del 95% y un error beta del 20% y se   obtuvo una muestra total de 41 casos   y 82 controles. Se incluyeron pacientes   mayores de 18 a&ntilde;os de edad y   menores de 65 a&ntilde;os, de ambos sexos,   que no presentaban enfermedades o   consumieran medicamentos que se   asocien a EDM y TAG (por ejemplo,   infarto agudo de miocardio, diabetes,   c&aacute;ncer, anticonceptivos orales o   antipsic&oacute;ticos), para posteriormente   parearlos con los controles por edad   (&plusmn;5 a&ntilde;os), sexo y nivel socioecon&oacute;mico.   Todos los pacientes (casos y controles)   asist&iacute;an a consulta a cl&iacute;nica   privada de la ciudad.</p>     <p>   Para evaluar la presencia de   EDM y TAG se aplic&oacute; la entrevista   cl&iacute;nica estructurada para los trastornos   del eje I del DSM-IV (SCIDI)   (27). La gravedad del asma fue   evaluada por un m&eacute;dico neum&oacute;logo   con gran experiencia en el &aacute;rea y   quien tuvo en cuenta los siguientes   criterios: asma severa -s&iacute;ntomas   diurnos continuos, actividad f&iacute;sica   totalmente limitada, crisis en m&aacute;s   de dos ocasiones por semana y s&iacute;ntomas   nocturnos m&aacute;s de una vez a   la semana- y asma leve -s&iacute;ntomas   diurnos m&aacute;s de una vez por semana   pero no m&aacute;s de una vez al d&iacute;a,   sin limitaci&oacute;n de la actividad f&iacute;sica,   crisis cortas y s&iacute;ntomas nocturnos   dos veces por semana-.</p>     <p>   Para el an&aacute;lisis estad&iacute;stico se   utiliz&oacute; el programa Stata 8.0, a fin   de obtener la raz&oacute;n de disparidad   pareada (OR) y el intervalo de confianza   del 95% (IC 95%), ajustado   por los potenciales factores de confusi&oacute;n   por medio de la regresi&oacute;n   log&iacute;stica condicional.</p>     <p>   <font size="3"><b>Resultados</b></font></p>     <p>   Se evaluaron 148 pacientes con   asma, 48 casos (asma severa) y 100   controles (asma leves), de los cuales   16 fueron excluidos del estudio por   presentar antecedentes de comorbilidad   con EDM y TAG (n=11) y se   negaron a participar (n=5). Finalmente,   se incluyeron 132 pacientes   con asma, 44 casos y 88 controles.</p>     <p>En la <a href="#t1">Tabla 1</a> se muestran las caracter&iacute;sticas   sociodemogr&aacute;ficas de los   casos como de los controles.</p>        ]]></body>
<body><![CDATA[<p>    <center><a name="t1"><img src="img/revistas/rcp/v38n3/v38n3a06t1.gif"></a></center></p>     <p>   Se observ&oacute; que el 29,5% de   los pacientes con asma severa y el   27,2% de los pacientes con asma   leve reun&iacute;an criterios para EDM (OR   pareado=1,12; IC95% 0,46-2,69;   p=0,78). Por su parte, 43,1% de los   pacientes con asma severa reun&iacute;an   criterios para TAG frente al 45,4%   de los pacientes con asma leve (OR   pareado=1,10; IC95% 0,49-2,44;   p=0,80).</p>     <p>   La falta de asociaci&oacute;n entre la   severidad del asma y el EDM y el   TAG mantuvo en el an&aacute;lisis multivariado   condicional (OR pareado=   1,01; IC95% 0,35-2,85) para   EDM y (OR pareado=1,50; IC95%   0,50-4,34) para TAG despu&eacute;s de   controlar posibles confusores.</p>     <p>   <font size="3"><b>Discusi&oacute;n</b></font></p>     <p>   El presente estudio muestra   que la presencia de EDM y TAG no   se relacionan con la severidad del asma, a pesar de contar con un   poder muestral para detectar asociaci&oacute;n   con OR mayor de 3,5 con   ambas entidades por arriba del 80%   (EDM: 96,8% y TAG: 88,2%).</p>     <p>   En este estudio se mostr&oacute; que   la prevalencia de TDM y TAG es similar   en ambos grupos estudiados.   Estos hallazgos son similares a los   encontrados en cuatro investigaciones   cl&iacute;nicas y una en la poblaci&oacute;n   general que observaron que la prevalencia   de TDM y TAG era similar   en pacientes con asma leve o severa   (28-32).</p>     <p>   Varios estudios informan que la   prevalencia de trastornos mentales,   como el TDM y el TAG, es mayor en   pacientes con asma que en pacientes   con otras patolog&iacute;as m&eacute;dicas y que   en la poblaci&oacute;n general (12,14,33-   39). En el Estudio Mundial de Salud   Mental de Colombia se observ&oacute; una   asociaci&oacute;n significativa entre TDM y   asma; mientras que no se observ&oacute;   relaci&oacute;n alguna entre TAG y asma   (10). No obstante, algunos estudios   longitudinales documentan que la presencia de asma no incrementa el   riesgo de trastornos depresivos o de   trastornos de ansiedad (40).</p>     <p>   Parece que la severidad del asma   no guarda relaci&oacute;n con esta mayor   frecuencia. La diferencia entre los   casos y los controles no se observ&oacute;   a pesar de que en la presente investigaci&oacute;n   no se excluyeron los pacientes   que recib&iacute;an beta 2 agonistas,   dado que estos medicamentos son   esenciales en el manejo de asma.   Se conoce que los beta adren&eacute;rgicos   pueden inducir o exacerbar los s&iacute;ntomas   emocionales, particularmente   manifestaciones ansiosas (41,42).</p>     <p>   La alta prevalencia de TDM y   TAG en pacientes con asma sugiere   una valoraci&oacute;n m&eacute;dica especializada   en este grupo de personas, para   identificar la presencia de trastornos   mentales, independientemente   de la cronicidad de la enfermedad.   Con mayor frecuencia, los pacientes   con asma y trastornos mentales   asociados consultan a urgencias,   necesitan tratamiento intrahospitalario   y tienen menor calidad de   vida, lo que incrementa los costos   en servicios de salud (15,30).</p>     ]]></body>
<body><![CDATA[<p>   Un aporte importante de este   estudio es mostrar que la cronicidad   del asma no explica la mayor prevalencia   de TDM y TAG en este grupo   de pacientes con un buen poder de   predicci&oacute;n como para aceptar la falta   de asociaci&oacute;n. No obstante, se pueden   considerar como limitaciones la   falta de un segundo grupo control con   otro tipo de patolog&iacute;a respiratoria o de   un tercer grupo control con otra patolog&iacute;a   cr&oacute;nica no respiratoria como la   hipertensi&oacute;n arterial. Lo mismo que   la definici&oacute;n cl&iacute;nica de la severidad   del asma, cuando se considera la   espirometr&iacute;a como la mejor prueba   paracl&iacute;nica para la clasificaci&oacute;n del   asma, y el no controlar el tiempo de   evoluci&oacute;n de la patolog&iacute;a.</p>     <p>   <font size="3"><b>Conclusi&oacute;n</b></font></p>     <p>   No hay asociaci&oacute;n entre el EDM   y el TAG con el grado de severidad   del asma en la poblaci&oacute;n de Bucaramanga,   Colombia. Son necesarios   m&aacute;s estudios que corroboren esta   falta de asociaci&oacute;n, controlando   otros factores confusores no explorados   en la presente investigaci&oacute;n.</p>     <p>   <b><font size="3">Referencias</font></b></p>     <!-- ref --><p>   1. Centers for Disease Control and Prevention   (CDC). Self-report asthma prevalence   among adults--United States   2000. 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<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<collab>Centers for Disease Control and Prevention (CDC)</collab>
<article-title xml:lang="en"><![CDATA[Self-report asthma prevalence among adults--United States 2000]]></article-title>
<source><![CDATA[MMWR Morb Mortal Wkly Rep]]></source>
<year>2001</year>
<volume>50</volume>
<numero>32</numero>
<issue>32</issue>
<page-range>682-6</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
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