1. Department of Surgery, Kangbuk Samsung HospitalSungkyunkwan University School of Medicine Seoul Republic of Korea
2. Center for Cohort Studies, Total Healthcare Center, Kangbuk Samsung HospitalSungkyunkwan University School of Medicine Seoul Republic of Korea
3. Department of Occupational and Environmental Medicine, Kangbuk Samsung HospitalSungkyunkwan University School of Medicine Seoul Republic of Korea
4. Department of Clinical Research Design & Evaluation, SAIHSTSungkyunkwan University Seoul Republic of Korea
5. Department of Surgery, Eunpyeong St. Mary's HospitalThe Catholic University of Korea College of Medicine Seoul Korea
6. Department of Family Medicine, Kangbuk Samsung HospitalSungkyunkwan University School of Medicine Seoul Republic of Korea