0123-5931 0123-5931 S0123-59312019000200267 10.15446/lthc.v21n2.78665 Colombia 00 12 2019 00 12 2019 21 2 267 285

2019 2010 I y II 2019 126-219 13-45 1978 49-86 1999 197-248 1995 1989 29 29 61-104 2012 30 30 81-107 1948