[1] Univ Pittsburgh, Sch Med, Ctr Adolescent & Young Adult Hlth, 120 Lytton Ave, Pittsburgh, PA 15213 USA
[2] UPMC Childrens Hosp Pittsburgh, Ctr Adolescent & Young Adult Hlth, 120 Lytton Ave, Pittsburgh, PA 15213 USA
[3] Univ Virginia, Dept Family Med, 1215 Lee St, Charlottesville, VA 22908 USA
[4] West Virginia Univ, Dept Pediat, POB 9214, Morgantown, WV 26506 USA