1. Department of Surgery, Yonsei University College of Medicine, Seoul, South Korea2Department of Breast Cancer Center, Yonsei University College of Medicine, Seoul, South Korea
2. Department of Breast Cancer Center, Yonsei University College of Medicine, Seoul, South Korea3Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, South Korea4Division of Pathology, NSABP Foundation, Pittsburgh, Pennsylvan