TI - TOpic collections PT - JOUR DP - 2007 TA - Archives of Pediatrics & Adolescent Medicine pages = {668}, VI - 161 IP - 7 AID - 10.1001/archpedi.161.7.668 [doi] 4100 - http://dx.doi.org/10.1001/archpedi.161.7.668 SO - Archives of Pediatrics & Adolescent Medicine July 1, 2007 161(7):668