1. Laboratory of Reproductive Medicine; Cheil General Hospital & Women's Healthcare Center; College of Medicine; Dankook University; Seoul Korea
2. Department of Obstetrics and Gynecology; Cheil General Hospital & Women's Healthcare Center; College of Medicine; Dankook University; Seoul Korea
3. Reproductive Medicine; Department of Obstetrics and Gynecology; Chicago Medical School at Rosalind Franklin University of Medicine and Science; Vernon Hills IL USA
4. Department of Microbiology and Immunology; Chicago Medical School at Rosalind Franklin University of Medicine and Science; North Chicago IL USA