作者单位:
Univ N Carolina, Dept Epidemiol & Maternal & Child Hlth, Gillings Sch Global Publ Hlth, Chapel Hill
[1]
Univ N Carolina, Dept Maternal & Child Hlth, Gillings Sch Global Publ Hlth, Chapel Hill, NC 27599
[2]
Community Care North Carolina, Raleigh, NC 27607 USA
[3]
Univ N Carolina, Carolina Populat Ctr, Chapel Hill, NC 27516 USA
[4]
Univ N Carolina, Div Maternal Fetal Med, Dept Obstet & Gynecol, Sch Med, Chapel Hill, NC 27514 USA
[5]
发布时间
2015-11-26