RT Journal T1 ABout this journal JF Archives of Pediatrics & Adolescent Medicine JO Archives of Pediatrics & Adolescent Medicine YR 2009 FD June 1 VO 163 IS 6 SP 502 OP 502 DO 10.1001/archpedi.163.6.502 UL http://dx.doi.org/10.1001/archpedi.163.6.502 AB