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| Effect of Dilation of the Uterine Orifice Upon Admission to the Delivery Room on Delivery Process and the Rate of Painless Delivery |
| WANG Lixia, CHEN Rongyao, ZHAO Taoyan |
| First-author's address: Department of Obstetrics and Gynecology, Jiujiang Maternal and Child Health Hospital, Jiujiang 332000, China |
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