[1] Childrens Natl Hlth Syst, Ctr Translat Sci, Washington, DC 20010 USA
[2] George Washington Univ, Sch Med, Dept Pediat, Washington, DC 20052 USA
[3] George Washington Univ, Sch Med, Dept Epidemiol & Biostat, Washington, DC 20052 USA
[4] Virginia Commonwealth Univ, Dept Pediat, Richmond, VA 23284 USA
[5] Georgetown Univ, Dept Psychiat, Washington, DC 20057 USA
[6] Childrens Natl Hlth Syst, Dept Endocrinol & Metab, Washington, DC 20010 USA