[1] Univ Arkansas Med Sci, Arkansas Ctr Birth Defects Res & Prevent, Fay W Boozman Coll Publ Hlth, Little Rock, AR 72205 USA
[2] Icahn Sch Med Mt Sinai, Dept Environm Med & Publ Hlth, New York, NY 10029 USA
[3] Univ Arkansas Med Sci, Arkansas Ctr Birth Defects Res & Prevent, Fay W Boozman Coll Publ Hlth, Little Rock, AR 72205 USA
[4] Univ Arkansas Med Sci, Dept Maternal Fetal Med, Little Rock, AR 72205 USA
[5] Univ Arkansas Med Sci, Dept Epidemiol, Fay W Boozman Coll Publ Hlth, Little Rock, AR 72205 USA