1812-9528 1812-9528 S1812-95282016000300081 10.18004/mem.iics/1812-9528/2016.014(03)81-085 Paraguay 00 12 2016 00 12 2016 14 3 81 85

2005 3ra 2008 4ta 2009 2010 2da 1994 2009 13 2 2 203-8 OMS 2007 2014 4 3 3 175-81 2012 7 2 2 21-33 2013 18 1 1 76-80 2014 22 3 3 152-8 2006 72 4 4 323a-k Center of Disease Control Prevention 1997 2015 1986 14 6 6 320-2 1978 13 4 4 382-9 2006 17 5 5 138-44