[1] Univ Calif Los Angeles, Dept Psychiat, Hlth Risk Reduct Projects, Integrated Subst Abuse Programs, Los Angeles, CA 90024 USA
[2] Univ Calif Los Angeles, Sect Oral & Maxillofacial Surg, Los Angeles, CA USA
[3] Childrens Hosp Los Angeles, Div Plast & Maxillofacial Surg, Los Angeles, CA 90027 USA
[4] Univ So Calif, Dept Oral & Maxillofacial Surg, Los Angeles, CA USA