[1] Jinan Univ, Sch Med, Dept Publ Hlth & Prevent Med, Guangzhou, Peoples R China
[2] Ganzhou Maternal & Child Hlth Hosp, Dept Gynaecol & Obstet, Ganzhou, Peoples R China
[3] Southern Med Univ, Foshan Inst Fetal Med, Affiliated Foshan Matern & Child Healthcare Hosp, Dept Obstet, Foshan, Peoples R China
[4] Zunyi Med Univ, Sch Publ Hlth, Dept Prevent Med Lab, Zunyi, Guizhou, Peoples R China
[5] Zhengzhou Univ, Dept Nutr, Affiliated Hosp 1, Zhengzhou, Peoples R China
[6] Zunyi Med Univ, Dept Gynaecol & Obstet, Affiliated Hosp, Zunyi, Guizhou, Peoples R China