中国计划生育学杂志
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Clinical control observation of the immediate intrauterine device inserted and the combination oral contraception used after abortion in nulliparous women aged 25 years old or younger
1.Tianjin Third Central Hospital, Tianjin, 300170;2.National Research Institute for Family Planning;3.Huai'an Maternal and Child Health Care Hospital of Jiangsu Province;4.People’s Hospital of Rizhao of Shandong Province;5.Wuhan City Maternal and Child Health Hospital of Hubei Province