2215-3535 2215-3535 S2215-35352017000200002 10.15517/ap.v31i123.26441 Costa Rica Ecuador 00 12 2017 00 12 2017 31 123 2 12

2001 81 116-32 2002 14 476-82 2004 8 291-322 2008 1975 16 553-72 1992 63 452-9 2006 Philadelphia, PA 2009 2015 26 9227 2013 24 102-8 2014 3-28 2013 104 103-25 2010 31 334-47 1999 1991 12 888 1992 2005 2012 102 351-66 2002 26 167-76 2014 23 433-8 2008 32 76-88 2002 5 466-74 2001 22 1-32 2007 28 345-51 2005 102 8939-43 2003 71 141-7 2006 2015 33 233-49 2009 69 571-8 2009 74 107-20 2008 15 425-44 2011 448-51 2008 45 542-8 2009 8 196-213 2007 92 506-25 2008 29 402-15 2011 278 2223-32 2011 366 1008-16