0034-7426 0034-7426 S0034-74262018000100041 10.15446/recolma.v1n52.74554 Chile Chile Chile Chile 00 06 2018 00 06 2018 52 1 41 57

1 2 2017 3 1995 328 23-38 4 1997 25 9 9 3001-9 5 1977 52 6 1992 65 313-32 7 1986 8 2004 7 9 2017