[1] Chongqing Med Univ, Dept Obstet, Affiliated Hosp 1, 1 Youyi Rd, Chongqing 400016, Peoples R China
[2] Chongqing Med Univ, China Canada New Zealand Joint Lab Maternal & Fet, Chongqing, Peoples R China
[3] Maternal & Child Hlth Hosp Hubei Prov, Wuhan, Peoples R China
[4] Chongqing Med Univ, Clin Inst 1, Chongqing, Peoples R China
[5] Chongqing Med Univ, Sch Publ Hlth & Management, Chongqing, Peoples R China
[6] Shanghai Jiao Tong Univ, MOE Shanghai Key Lab Childrens Environm Hlth, Xin Hua Hosp, Sch Med, Shanghai, Peoples R China
[7] Chongqing Med Univ, Dept Neonatol, Childrens Hosp, Chongqing, Peoples R China
[8] Univ Leicester, Coll Life Sci, Leicester, Leics, England