1. Department of Obstetrics and Gynecology, Kyung Hee University Hospital at Gangdong, Seoul 05278, Republic of Korea
2. Department of Medicine, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
3. Medical Big Data Research Center, Research Institute of Clinical Medicine, Kyung Hee University Hospital at Gangdong, Seoul 05278, Republic of Korea