1. Graduate Institute of Management, College of Management, Chang Gung University, Taoyuan, Taiwan
2. Department of Health Care Management, College of Management, Chang Gung University, Taoyuan, Taiwan
3. Department of Radiation Oncology, Chang Gung Memorial Hospital, Linkou Branch, Taiwan
4. Department of Public Health Sciences, Graduate School of Public Health, Seoul National University, Seoul, South Korea
5. Institute of Health and Environment, Seoul National University, Seoul, South Korea