1. Division of Breast Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
2. Department of Surgery, Ajou University School of Medicine, Suwon, South Korea
3. Department of Surgery, Konkuk University Medical Center, Seoul, South Korea
4. Department of Surgery, Ewha Womans University College of Medicine, Ewha Womans University Mokdong Hospital, Seoul, South Korea
5. Department of Surgery, Korea Cancer Center Hospital, Korea Institute of Radiological and Medical Sciences, Seoul, South Korea
6. Division of Breast Surgery, Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
7. Division of Breast Surgery, Department of Surgery, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, South Korea
8. Center for Breast Cancer, Research Institute and Hospital, National Cancer Center, Goyang, South Korea
9. Seoul National University Hospital, Cancer Research Institute, Seoul National University College of Medicine, Seoul, South Korea
10. Department of Surgery, Chonnam National University Medical School, Chonnam National University Hwasun Hospital, Gwangju, South Korea
11. Department of Internal Medicine, Division of Medical Oncology/Hematology, Korea University Anam Hospital, Seoul, South Korea
12. Yeungnam University College of Medicine, Daegu, South Korea
13. Division of Breast Surgery, Department of Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
14. Dong-A University Hospital, Dong-A University College of Medicine, Busan, South Korea
15. Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, South Korea
16. Department of Surgery, Soonchunhyang University Hospital, Seoul, South Korea
17. Department of Surgery, Chung-Ang University Gwangmyeong Hospital, Gwangmyeong, South Korea
18. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, Seoul, South Korea