[1] Univ N Carolina, Sch Med, Clin Ctr Study Dev & Learning, Carolina Inst Dev Disabil, Chapel Hill, NC 27599 USA
[2] Univ Texas SW Med Ctr, Ctr Pediat Psychiat, Childrens Med Ctr Dallas, Dallas, TX USA
[3] Univ Texas SW Med Ctr, Dept Psychiat, Dallas, TX USA
[4] Univ N Carolina, Sch Med, Dept Psychiat, Chapel Hill, NC 27599 USA
[5] Univ N Carolina, Sch Med, Dept Pediat, Chapel Hill, NC 27599 USA
[6] Univ Utah, Dept Pediat, Sch Med, Salt Lake City, UT 84112 USA
[7] Univ N Carolina, Sch Med, Injury Prevent Res Ctr, Chapel Hill, NC 27599 USA
[8] Univ N Carolina, Sch Med, Dept Social Med, Chapel Hill, NC 27599 USA
[9] Univ N Carolina, Sch Med, Dept Pediat, Chapel Hill, NC 27599 USA