Sungkyunkwan University - Department of Family Medicine/Supportive Care Center, Eulji University - College of Medicine, Chungbuk National University - College of Medicine, Chungbuk National University - Chungbuk National University Hospital, Chung-Ang University, Chungbuk National University - College of Medicine, National Health Insurance Service, Chungbuk National University - Institute of Health & Science Convergence and Harvard University - Department of Society, Human Development, and Health