1. Matsuyama Red Cross Hospital Department of Breast Surgery, , Matsuyama, Japan
2. Kumamoto University Graduate School of Medical Sciences Department of Breast and Endocrine Surgery, , Kumamoto, Japan
3. Fukushima Medical University Department of Medical Oncology, , Fukushima, Japan
4. Nagoya University Graduate School of Medicine Department of Department of Breast and Endocrine Surgery, , Nagoya, Japan
5. Osaka International Cancer Institute Department of Breast and Endocrine Surgery, , Osaka, Japan
6. NHO Shikoku Cancer Center Department of Breast Oncology, , Matsuyama, Japan
7. Kitakyushu Municipal Medical Center Department of Surgery, , Kitakyushu , Japan
8. Hiroshima City Hiroshima Citizens Hospital Department of Breast Surgery, , Hiroshima, Japan
9. Niigata Cancer Center Hospital Department of Breast Oncology, , Niigata, Japan
10. Toranomon Hospital Department of Medical Oncology, , Tokyo, Japan
11. Kyushu Cancer Center Department of Breast Oncology, , Fukuoka, Japan
12. Showa University School of Medicine Department of Surgery, Division of Breast Surgical Oncology, , Tokyo, Japan
13. Hachinohe City Hospital Department of Breast Surgery, , Hachinohe, Japan
14. Aichi Cancer Center Hospital Department of Breast Oncology, , Nagoya, Japan
15. Gunma Prefectural Cancer Center Department of Breast Oncology, , Ohta, Japan
16. Graduate School of Medicine, Kyoto University Department of Biomedical Statistics and Bioinformatics, , Kyoto, Japan
17. JCHO Kurume General Hospital Department of Breast Surgery, , Kurume, Japan
18. Kanagawa Cancer Center Department of Breast and Endocrine Surgery, , Yokohama, Japan
19. Hakuaikai Social Medical Corporation, Sagara Hospital Department of Breast and Thyroid Surgery, , Kagoshima, Japan
20. Kyoto University Department of Breast Surgery, Graduate School of Medicine, , Kyoto, Japan
21. The Cancer Institute Hospital of JFCR Breast Oncology Center, , Tokyo, Japan