2215-4175 2215-4175 S2215-41752018000100583 10.15517/aeca.v44i0.34990 Costa Rica 00 12 2018 00 12 2018 44 583 587 2018 Guatemala 2009 2015 19 38 38 67 1996 1 1 1 90 1999 1995 32 43-64 2002 1996