TI - TRial registration required PT - JOUR DP - 2006 TA - Archives of Pediatrics & Adolescent Medicine pages = {401}, VI - 160 IP - 4 AID - 10.1001/archpedi.160.4.401 [doi] 4100 - http://dx.doi.org/10.1001/archpedi.160.4.401 SO - Archives of Pediatrics & Adolescent Medicine April 1, 2006 160(4):401