1409-3871 1409-3871 S1409-38712017000200223 10.15517/lank.v17i2.30077 USA Colombia 00 08 2017 00 08 2017 17 2 223 226

1986 16 1-63 2000 a 77 1-264 2000 b 82 1-518 2001 16 4 4 235-71