1. Department of Surgery, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
2. Breast-Thyroid Center, Ulsan City Hospital, Ulsan, Korea.
3. Department of Surgery, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Uijeongbu, Korea.
4. Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Surgery, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
7. Breast-Thyroid Center, Saegyaero Hospital, Busan, Korea.