- Address correspondence and reprint requests to Jeong-Yeol Park, MD, PhD, Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea. E-mail: .
- Received December 14, 2016
- Accepted July 26, 2017
- First published January 1, 2018.
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