| نویسندگان مقاله |
| Liren Yang 1. Department of Obstetrics and Gynecology, Maternal & Child Health Center, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710061, P.R. China 2. School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710061, P.R. China
| Cuifang Qi Department of Obstetrics and Gynecology, Maternal & Child Health Center, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710061, P.R. China
| Zixuan Yang Antai College of Economics and Management, Shanghai Jiao Tong University, Shanghai, 200030, P.R. China
| Li Shang 1. Department of Obstetrics and Gynecology, Maternal & Child Health Center, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710061, P.R. China 2. School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710061, P.R. China
| Guilan Xie 1. Department of Obstetrics and Gynecology, Maternal & Child Health Center, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710061, P.R. China 2. School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710061, P.R. China
| Ruiqi Wang 1. Department of Obstetrics and Gynecology, Maternal & Child Health Center, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710061, P.R. China 2. School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710061, P.R. China
| Landi Sun 1. Department of Obstetrics and Gynecology, Maternal & Child Health Center, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710061, P.R. China 2. Peking University Health Science Center, Beijing 100191, P.R. China
| Mengmeng Xu 1. Department of Obstetrics and Gynecology, Maternal & Child Health Center, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710061, P.R. China 2. Henan University, Kaifeng, Henan 475001, P.R. China
| Wenfang Yang Department of Obstetrics and Gynecology, Maternal & Child Health Center, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710061, P.R. China
| Mei Chun Chung Department of Public Health and Community Medicine, Tufts University School of Medicine, Massachusetts Boston, United States of America
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