1. Department of Dental Hygiene; The Graduate School; Yonsei University; Seoul Korea
2. Department of Health Administration; The Graduate School; Yonsei University; Wonju Korea
3. Department of Preventive Medicine; Institute for Poverty Alleviation and International Development (IPAID); Wonju College of Medicine; Yonsei University; Wonju Korea
4. Department of Nursing Science; Wonju College of Medicine; Yonsei University; Wonju Korea
5. Department of Dental Hygiene; Wonju College of Medicine; Yonsei University; Wonju Korea