1. Department of Surgery, School of Medicine, Kyungpook National University, Daegu, Korea.
2. Department of Surgery, Kyungpook National University Chilgok Hospital, Daegu, Korea.
3. Department of Surgery, H Plus Yanji Hospital, Seoul, Korea.
4. Department of Biomedical Informatics, College of Medicine, Konyang University, Daejun, Korea.
5. Department of Preventive Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.