0001-6002 0001-6002 S0001-60022018000300139 Costa Rica 00 09 2018 00 09 2018 60 3 139 141

1 2016 648-9 2 2016 42 550-62 3 2015 27 729-31 4 2016 148 38-44 5 2016 103 473-7 6 2016 22 e552-4 7 2016 22 96-102 8 2013 225 152-8 9 2015 21 358-64