0121-0793 0121-0793 S0121-07932016000400478 Colombia Colombia Colombia 00 10 2016 00 10 2016 29 4 478 484

1990 335 8689 8689 606 2012 12 5 5 289-98 2014 349 g4737 National Clinical Guideline Centre (UK) 2014 199 2014 95 11 11 2199-206 2009 1 9 9 852-8 2002 24 8 8 443-53 2002 56-7 1994 44 11^s9 11^s9 9 S60-8 1989 320 23 23 1553-5 2009 47 10 10 751-6