1. Diabetes Education Unit, Samsung Medical Center, Seoul, Korea.
2. Catholic Institute for Healthcare Management, the Catholic University of Korea, Seoul, Korea.
3. Department of Healthcare Management at Eulji University, Seongnam, Korea.
4. Department of Internal Medicine, Samsung Medical Center, Seoul, Korea.
5. Department of Humanities and Social Medicine, College of Medicine and Catholic Institute for Healthcare Management, the Catholic University of Korea, Seoul, Korea.