[1] Ctr Dis Control & Prevent, Child Dev Studies Team, Div Human Dev & Disabil, Natl Ctr Birth Defects & Dev Disabil, 4770 Buford Hwy S106-4, Atlanta, GA 30341 USA
[2] Ctr Dis Control & Prevent, Res Participat Programs, Oak Ridge Inst Sci & Educ, POB 117, Oak Ridge, TN 37831 USA
[3] Emory Univ, Rollins Sch Publ Hlth, Atlanta, GA USA
[4] Ctr Dis Control & Prevent, Off Strategy & Innovat, Natl Ctr Injury Prevent & Control, 4770 Buford Hwy S106-4, Atlanta, GA 30341 USA
[5] Ctr Dis Control & Prevent, Minor Hlth & Hlth Equ Sci Team, Off Minor Hlth & Hlth Equ, 4770 Buford Hwy S106-4, Atlanta, GA 30341 USA
[6] Hlth Resources & Serv Adm, Maternal & Child Hlth Bur, Off Epidemiol & Res, 5600 Fishers Lane, Rockville, MD 20857 USA
[7] Oglethorpe Univ, 4484 Peachtree Rd NE, Atlanta, GA 30319 USA