1. Department of Public Health, Hokkaido University Graduate School of Medicine
2. Hokkaido University Center for Environmental and Health Sciences
3. Department of Nursing, Faculty of Health Science, Hokkaido University of Science
4. Department of Health Sciences, Hokkaido University Graduate School of Medicine
5. Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine
6. Department of Obstetrics and Gynecology, School of Medicine, Sapporo Medical University
7. Department of Obstetrics and Gynecology, Asahikawa Medical University