2215-2458 2215-2458 S2215-24582017000200027 10.15517/isucr.v18i38.32667 Costa Rica 00 12 2017 00 12 2017 18 38 27 56

2003 2011 2007 8 2 2 348-53 2006 2004 2009 5 2 2 1993 15 5-9 2006 36 36 2007 2011 1995 78-93 1997