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中华妇幼临床医学杂志(电子版)
Efficacy and safety of cervical pessaries for preventing preterm birth in twin pregnancy: a systematic review
Tingting Xu, Zhiyi Zhou, Na Liu, Chunyan Deng, Guiqiong Huang, Xiaodong Wang, Haiyan Yu
Chinese Journal of Obstetrics & Gynecology and Pediatrics(Electronic Edition) . 2019, (03): 253 -261 .  DOI: 10.3877/cma.j.issn.1673-5250.2019.03.004

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