1. Department of Midwifery, Oita University of Nursing and Health Sciences, Oita, Japan.
2. Department of Health Sciences, Oita University of Nursing and Health Sciences, Oita, Japan.
3. Department of Adult Nursing, Ishikawa Prefectural Nursing University, Ishikawa, Japan.
4. Department of Dermatology, Faculty of Medicine, Oita University, Oita, Japan.
5. Clinical Research Promotion Unit, Shizuoka Cancer Center, Shizuoka, Japan.
6. Department of Environmental Engineering, Kyoto University, Kyoto, Japan.