Affiliation: | 1. Department of Family Medicine, Yong-In Severance Hospital, Yonsei University College of Medicine, Yong-In, Republic of Korea;2. Department of Medicine, Graduate School, Yonsei University, Seoul, Republic of Korea;3. Biostatistics Collaboration Unit, Department of Research Affairs, Yonsei University College of Medicine, Seoul, Republic of Korea;4. Department of Family Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea |