1. Department of Public Health Administration, Faculty of Public Health and Research and Training Centre for Enhancing Quality of Life for Working Age People, Khon Kaen University, Khon Kaen, Thailand
2. National Health Security Office Region 8 Udon Thani, Udon Thani, Thailand
3. Community Public Health, Sirindhorn College Public Health, Khon Kaen, Thailand
4. That Phanom Crown Prince Hospital, Nakorn Phanom, Thailand