1. Department of Periodontics, Chang Gung Memorial Hospital, Linko Medical Center, Taoyuan, Taiwan
2. Department of Nursing, Mackay Medical College, New Taipei City, Taiwan
3. Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linko Medical Center, Taoyuan, Taiwan
4. Department of Nursing, New Taipei City Tucheng Hospital, New Taipei City, Taiwan
5. Department of Nursing, Chang Gung University of Science and Technology, Taoyuan, Taiwan