[1] Univ Michigan, Dept Pediat, Div Adolescent Med, Ann Arbor, MI USA
[2] Uniformed Serv Univ Hlth Sci, Dept Family Med, Bethesda, MD USA
[3] Uniformed Serv Univ Hlth Sci, Dept Pediat, Bethesda, MD USA
[4] David Grant Med Ctr, Dept Family Med, Travis Afb, CA USA
[5] Univ Texas Southwestern Med Ctr, Dept Pediat, Div Dev Behav Pediat, Dallas, TX USA
[6] Columbia Univ, Dept Populat & Family Hlth, Mailman Sch Publ Hlth, New York, NY USA
[7] Columbia Univ, Dept Pediat, Coll Phys & Surg, New York, NY USA
[8] Northwestern Univ, Ann & Robert H Lurie Childrens Hosp Chicago, Potocsnak Family Div Adolescent & Young Adult Med, Feinberg Sch Med, Chicago, IL USA
[9] Alberta Childrens Prov Gen Hosp, Dept Pediat, Sect Adolescent Med, Calgary, AB, Canada
[10] Univ Calgary, Cumming Sch Med, Dept Pediat, Calgary, AB, Canada
[11] Univ Calif Los Angeles, Dept Pediat, Div Adolescent & Young Adult Med, Los Angeles, CA USA
[12] 1500 E Med Ctr Dr, Ann Arbor, MI 48109 USA