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Sichuan Univ, West China Univ Hosp 2, Natl Off Maternal & Child Hlth Surveillance China, Chengdu, Sichuan, Peoples R China
Sichuan Univ, West China Univ Hosp 2, Key Lab Birth Defects & Related Dis Women & Child, Minist Educ, Chengdu, Peoples R China Sichuan Univ, West China Univ Hosp 2, Natl Off Maternal & Child Hlth Surveillance China, Chengdu, Sichuan, Peoples R China