TI - TRial registration required PT - JOUR DP - 2006 TA - Archives of Pediatrics & Adolescent Medicine pages = {1231}, VI - 160 IP - 12 AID - 10.1001/archpedi.160.12.1231 [doi] 4100 - http://dx.doi.org/10.1001/archpedi.160.12.1231 SO - Archives of Pediatrics & Adolescent Medicine December 1, 2006 160(12):1231