1. St. Luke's College of Nursing; Research Center for Development of Nursing Practice; 3-8-5 Tsukiji, Chuo-ku Tokyo Japan 104-0045
2. St. Luke's College of Nursing; Maternal Infant Nursing and Midwifery; 10-1 Akashi-cho, Chuo-ku Tokyo Japan 104-0044
3. Nagasaki University; Graduate School of Biomedical Sciences, Division of Reproductive Health-International Health Nursing; Nagasaki Tokyo Japan
4. National Center for Child Health and Development; Department of Health Policy; 2-10-1 Okura Setagaya-ku Tokyo Tokyo Japan 166-0014