TI - TOpic collections PT - JOUR DP - 2009 TA - Archives of Pediatrics & Adolescent Medicine pages = {391}, VI - 163 IP - 4 AID - 10.1001/archpedi.163.4.391 [doi] 4100 - http://dx.doi.org/10.1001/archpedi.163.4.391 SO - Archives of Pediatrics & Adolescent Medicine April 6, 2009 163(4):391