[1] Univ Pittsburgh, Childrens Hosp Pittsburgh, Med Ctr, Pittsburgh, PA 15213 USA
[2] Univ Pittsburgh, Sch Med, Dept Pediat, Pittsburgh, PA 15261 USA
[3] RAND Corp, Pittsburgh, PA USA
[4] Univ Pittsburgh, Clin & Translat Sci Inst, Pittsburgh, PA USA
[5] Univ Pittsburgh, Sch Med, Dept Psychiat, Pittsburgh, PA USA