1. Department of Surgery, Research Institute of Clinical Medicine, Chonbuk National University Hospital, Chonbuk National University and Biomedical Research Institute, Jeonju, Korea.
2. Department of Surgery, Chosun University Hospital, Chosun University College of Medicine, Gwangju, Korea.
3. Department of Surgery, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea.
4. Department of Surgery, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Busan, Korea.
5. Division of Breast and Endocrine Surgery, Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. The Korea Central Cancer Registry, Division of Cancer Registration and Surveillance, National Cancer Center, Goyang, Korea.