1. Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo
2. Center for Medical Genetics, Keio University School of Medicine, Tokyo
3. Department of Clinical Genomic Medicine, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama
4. Division of Diagnostic Pathology, Keio University Hospital, Tokyo
5. Department of Obstetrics and Gynecology, International University of Health and Welfare School of Medicine, Chiba, Japan