1. Fukushima Regional Center for the Japan Environment and Children's Study Fukushima Japan
2. Department of Obstetrics and Gynecology Fukushima Medical University School of Medicine Fukushima Japan
3. Department of Pediatrics Fukushima Medical University School of Medicine Fukushima Japan
4. Department of Public Health Fukushima Medical University School of Medicine Fukushima Japan
5. Fukushima Medical Center for Children and Women Fukushima Medical University Fukushima Japan