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Sun Kyoung Yum, M.D., Byung-Koo Yoon, M.D., Ph.D., Byoung Ick Lee, M.D., Hyoung Moo Park, M.D., Ph.D., Tak Kim, M.D., Ph.D. Department of Obstetrics and Gynecology, Korea University Anam Hospital, Korea University College of Medicine; Department of Obstetrics and Gynecology, Sungkyunkwan University School of Medicine, Seoul; Department of Obstetrics and Gynecology, Inha University College of Medicine, Incheon; Department of Obstetrics and Gynecology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea
Yum et al. (Sun,) studied this question.
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