- Address correspondence and reprint requests to Liping Gu, MD, Department of Obstetrics and Gynecology, The Second Bethune Hospital of Jilin University, 218 Ziqiang Ave, Nanguan District, Changchun City, Jilin Province 130041, China. E-mail: email@example.com.
- Received August 20, 2017
- First published February 1, 2018.
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