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Knowledge, attitudes and practices of combined oral contraceptives in Tianjin obstetrics and gynecology personnels
HUO Yan, ZHANG Yujuan, WANG Jianmei△, YANG Jing, XIE Guohua
Tianjin Medical Journal . 2015, (
3
): 311 -314 . DOI: 10.11958/j.issn.0253-9896.2015.03.024