?:authorAffiliation
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[\'Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, People\'s Republic of China.\', \'Department of Obstetrics and Gynecology, Tufts University Medical School, Boston, MA.\', \'Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Shanghai Jiaotong University School of Medicin Renji Hospital, Shanghai, People\'s Republic of China.\', \'Department of Obstetrics and Gynecology, Chinese PLA General Hospital, Beijing, People\'s Republic of China.\', \'Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Shangdong, People\'s Republic of China.\', \'Department of Obstetrics and Gynecology, Union Hospital affiliated with TongJi Medical College, HuaZhong University of Science and Technology, Hubei, People\'s Republic of China.\', \'Department of Medical Affairs, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, People\'s Republic of China.\', \'Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, People\'s Republic of China. Electronic address: zhu_julie@vip.sina.com.\']
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