0034-7744 0034-7744 S0034-77442015000300575 Costa Rica 00 09 2015 00 09 2015 63 3 575 577

1984 Council of Science Editors 2006 1996 147 282-6 1981 37 3 3 397-400 2002 2012 2000 73 739-47 2009