1. Department of Breast Surgery, Chungbuk National University Hospital, College of Medicine, Chungbuk National University, Cheongju, Korea.
2. Department of Surgery, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
3. Clinical Research Center, Asan Institute for Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Biostatistics, Korea University, Seoul, Korea.
5. Department of Surgery, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
6. Department of Surgery, Asan Medical Center, Seoul, Korea.
7. Department of Surgery, Chonbuk National University Hospital, Jeonju, Korea.
8. Department of Surgery, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea.
9. Department of Surgery, Soonchunhyang University Seoul Hospital, Seoul, Korea.