0864-0319 0864-0319 S0864-03192018000400001 Peru 00 12 2018 00 12 2018 34 4 1 2007 20 4 4 499-503 2 2016 22 1 1 35-46 3 1979 3 4 4 86-7 4 2003 17 3 3 5 2017 4 1 1 21-7