1. Nursing Department, Tokushima Red Cross Hospital, Tokushima, Japan;
2. Department of Reproductive and Menopausal Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan;
3. Department of Obstetrics and Gynecology, Tokushima Red Cross Hospital, Tokushima, Japan;
4. Department of Preventive Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan