1. Department of Environmental Medical Science,
2. Environmental Health Science Project for Future Generations,
3. Department of Reproductive Medicine, and
4. Department of Bioenvironmental Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
5. Department of Obstetrics and Gynecology, Chiba University Hospital, Chiba, Japan
6. Center for Environment, Health and Field Sciences, Chiba University, Kashiwa, Japan