1. Division of Reproductive Endocrinology and Infertility; Department of Obstetrics and Gynecology; Cheil General Hospital and Women's Healthcare Center; Kwandong University College of Medicine; Seoul; Korea
2. Reproductive Medicine; Department of Obstetrics and Gynecology; Chicago Medical School at Rosalind Franklin University of Medicine and Science; North Chicago; IL; USA
3. Division of Maternal-Fetal Medicine; Department of Obstetrics and Gynecology; Cheil General Hospital and Women's Healthcare Center; Kwandong University College of Medicine; Seoul; Korea