1. Department of Surgery, Inha University College of Medicine, Incheon, Korea.
2. National Evidence-based Healthcare Collaborating Agency, Seoul, Korea.
3. Department of Surgery, Chung-Ang University College of Medicine, Seoul, Korea.
4. Department of Surgery, Soonchunhyang University Seoul Hospital, Seoul, Korea.
5. Department of Surgery, Gachon University of Medicine and Science, Incheon, Korea.
6. Department of Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
7. Department of Surgery, The Catholic University of Korea College of Medicine, Seoul, Korea.
8. Department of Surgery, Kangnam CHA Hospital, Seoul, Korea.
9. Department of Family Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
10. Department of Family Medicine, Inha University College of Medicine, Incheon, Korea.
11. Kyungpook National University College of Pharmacy, Daegu, Korea.