TI - TRial registration required PT - JOUR DP - 2007 TA - Archives of Pediatrics & Adolescent Medicine pages = {1081}, VI - 161 IP - 11 AID - 10.1001/archpedi.161.11.1081 [doi] 4100 - http://dx.doi.org/10.1001/archpedi.161.11.1081 SO - Archives of Pediatrics & Adolescent Medicine November 1, 2007 161(11):1081