0121-0793 0121-0793 S0121-07932016000300352 10.17533/udea.iatreia.v29n3a09 Colombia Colombia 00 07 2016 00 07 2016 29 3 352 358

1998 77 1 1 31-7 2015 1993 5 189-93 2007 357 11 11 e12 2010 29 2 2 133-9 2010 32 16 16 1339-45 2007 335 448-50 2015 2015