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Shandong Univ, Shenzhen Matern & Child Healthcare Hosp, Cheeloo Coll Med, Dept Obstet, Shenzhen, Guangdong, Peoples R China
Shandong Univ, Cheeloo Coll Med, Shandong Prov Maternal & Child Hlth Care Hosp, Dept Obstet, Jinan, Peoples R China
Shandong Prov Maternal & Child Hlth Care Hosp, Key Lab Birth Regulat & Control Technol, Natl Hlth Commiss China, Jinan, Peoples R China Shandong Univ, Shenzhen Matern & Child Healthcare Hosp, Cheeloo Coll Med, Dept Obstet, Shenzhen, Guangdong, Peoples R China