TI - TRial registration required PT - JOUR DP - 2006 TA - Archives of Pediatrics & Adolescent Medicine pages = {55}, VI - 160 IP - 1 AID - 10.1001/archpedi.160.1.55 [doi] 4100 - http://dx.doi.org/10.1001/archpedi.160.1.55 SO - Archives of Pediatrics & Adolescent Medicine January 1, 2006 160(1):55