1. Department of Family Medicine, Pusan National University School of Medicine, Yangsan, Korea.
2. Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.
3. Family Medicine Clinic and Research Institute of Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea.
4. Department of Medical Education, Pusan National University School of Medicine, Yangsan, Korea.