?:authorAffiliation
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[\'National Research Institute for Family Planning, Beijing, China.\', \'Graduate School, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.\', \'National Research Institute for Family Planning, Beijing, China. peikaiyan@nrifp.org.cn.\', \'Graduate School, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. peikaiyan@nrifp.org.cn.\']
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