1. Department of Family Medicine; Yong-in Severance Hospital; Yonsei University College of Medicine; Yong-in Korea
2. Department of Medicine; Gradauate School of Yonsei University College of Medicine; Seoul Korea
3. Biostatistics Collaboration Units; Department of Research Affairs; Yonsei University College of Medicine; Seoul Korea
4. Department of Family Medicine; Severance Hospital; Yonsei University College of Medicine; Seoul Korea
5. Department of Family Medicine; Gangam Severance Hospital; Yonsei University College of Medicine; Seoul Korea