1. Biomedical Sciences Department, Korea University College of Medicine , Seoul 02841 , Republic of Korea
2. Central Research Institute, Designed Cells Co., Ltd. , Cheongju 28576 , Korea
3. Department of Obstetrics and Gynecology, Korea University College of Medicine , Seoul 02841 , Republic of Korea
4. Department of Obstetrics and Gynecology, Seoul National University College of Medicine , Seoul 03080 , Republic of Korea