1. Division of Digestive and General Surgery, Niigata University Graduate School of Medical and Dental Sciences, Niigata City 951-8510, Japan
2. Breast Surgery, Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, New York 14263, USA
3. Department of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, New York 14263, USA
4. Department of Surgery, University at Buffalo Jacobs School of Medicine and Biomedical Sciences, The State University of New York, Buffalo, New York 14203, USA
5. Department of Breast Surgery and Oncology, Tokyo Medical University, Tokyo 160-8402, Japan
6. Department of Surgery, Yokohama City University, Yokohama 236-0004, Japan