1. Department of Obstetrics and Gynecology Nursing, Faculty of Nursing, Chiang Mai University, 239 Huay Kaew Rd, Tambon Su Thep, Amphoe Mueang Chiang Mai, Chang Wat Chiang Mai 50200, Thailand
2. Maharaj Nakorn Chiang Mai Hospital, Faculty of Medicine, Chiang Mai University, Amphoe Mueang Chiang Mai, Chang Wat Chiang Mai 50200, Thailand
3. Visiting Professor, Faculty of Nursing, Chiang Mai University, Amphoe Mueang Chiang Mai, Chang Wat Chiang Mai 50200, Thailand
4. Faculty of Health, Charles Darwin University, Ellengowan Drive, Casuarina, NT 0810, Australia