1. Department of Environmental Studies; University of Tokyo; Kashiwa Chiba Japan
2. National Institute for Environmental Studies; Tsukuba Ibaraki Japan
3. Department of Urology; St. Marianna University School of Medicine; Kawasaki Kanagawa Japan
4. Centre for Information; Jichi Medical University; Shimotsuke Tochigi Japan
5. Department of Growth and Reproduction; Rigshospitalet; Copenhagen University Hospital; Copenhagen Denmark
6. Center for Infertility and IVF; International University of Health and Welfare Hospital; Nasushiobara Tochigi Japan