1409-3871 1409-3871 S1409-38712019000100015 10.15517/lank.v19i1.36899 Costa Rica USA 00 04 2019 00 04 2019 19 1 15 20

1986 37 207 1989 2008 77 20-31 2012 12 1 1 53-60 2016 21 1 1 115-22 Guayaquil, Ecuador 2012 22 573 573 117-46 1884 22 573 573 776