1. Department of Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Surgery, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Surgery, Kyung Hee University Hospital at Gangdong, Kyung Hee University College of Medicine, Seoul, Korea.
5. Department of Surgery, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea.
6. Department of Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
7. Department of Surgery, Dankook University Hospital, Dankook University College of Medicine, Cheonan, Korea.
8. Department of Surgery, Dongnam Institute of Radiological and Medical Science, Busan, Korea.
9. Department of Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
10. Department of Surgery, Seoul Medical Center, Seoul, Korea.
11. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
12. Department of Surgery, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
13. Department of Surgery, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
14. Department of Surgery, Chung-Ang University Hospital, Seoul, Korea.
15. Department of Surgery, School of Medicine, Kyungpook National University, Kyungpook National University Chilgok Hospital, Daegu, Korea.
16. Division of Breast and Endocrine Surgery, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
17. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.