1. Kitamura Institute of Mental Health Tokyo, Tokyo 151-0063, Japan
2. Department of Midwifery and Women’s Health, The Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan
3. Department of Obstetrics and Gynecology, Graduate School of Medical Science, University of Tsukuba, Tsukuba 305-8577, Japan
4. Department of Obstetrics and Gynecology, Juntendo University, Tokyo 113-8421, Japan
5. Aiiku Research Institute for Maternal, Child Health and Welfare Imperial Gift Foundation Boshi-Aiiku-Kai, Tokyo 106-0047, Japan
6. Department of Perinatal Mental Health of Aiiku Clinic, Aiiku Maternal and Child Health Center, Tokyo 105-8321, Japan
7. Japanese Red Cross Medical Center, Tokyo 150-8935, Japan
8. Nagato Clinic, Tokyo 120-0002, Japan
9. Faculty of Nursing, Josai International University, Chiba 283-0002, Japan
10. Kitamura KOKORO Clinic Mental Health, Tokyo 151-0063, Japan
11. T. and F. Kitamura Foundation for Mental Health Research and Skill Advancement, Tokyo 151-0063, Japan
12. Department of Psychiatry, Graduate School of Medicine, Nagoya University, Nagoya 464-8601, Japan