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1. Peking Union Medical College Hospital,Beijing, P.R of China, 2. Postgraduate student in Dept of O/G, Peking Union Medical College Hospital, Beijing, P.R of China, 3. Department of Epidemiology and Statistics, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & School of Basic Medicine, Peking Union Medical College, Beijing, P.R of China, 4. Resident in Dept of O/G, Peking Union Medical College Hospital, Beijing, P.R of China, 5. Professor and Director in Dept of O/G, Peking Union Medical College Hospital, Beijing, P.R of China
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