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American Academy of Pediatrics 2012 129 e827-41 1981 98 883-7 2007 2009 71 757-65 2009 327505 1995 270 26746-9 2001 86 1930-5 2009 17 2004 61 418-23 2004 61 88-93 2009 123 682-9 2005 331 1120-6 2003 52 268-76 2010 156 ^s2 ^s2 2 S41-6 2007 54 532-9 2007 18 722-9 2010 68 542-4