1. Department of Family Medicine, Yonsei University College of Medicine, Seoul 03722, Republic of Korea
2. Department of Family Medicine, Gangnam Severance Hospital, Seoul 06273, Republic of Korea
3. Department of Family Medicine, Yongin Severance Hospital, Yongin 16995, Republic of Korea
4. Division of Biostatistics, Department of Biomedical Systems Informatics, Yonsei University College of Medicine, Seoul 03722, Republic of Korea