0026-1742 0026-1742 S0026-17422017000600030 México México 00 12 2017 00 12 2017 60 6 30 39 1 2013 2 2011 7 1 1 6-13 3 2008 46 236 236 141-54 4 2013 1-5 5 2011 6 2010 24 4 4 220:9 7 2000 87-98 8 2008 9 2006 74 3 3 217:22