1. Department of Medical Oncology, Fukushima Medical University , Fukushima , Japan
2. Department of Breast Oncology, National Hospital Organization Shikoku Cancer Center , Ehime , Japan
3. Department of Breast Surgery, Hiroshima City Hiroshima Citizens Hospital , Hiroshima , Japan
4. Department of Breast Surgical Oncology, St. Luke's International Hospital , Tokyo , Japan
5. Department of Medical Oncology, The Cancer Institute Hospital of the Japanese Foundation for Cancer Research , Tokyo , Japan
6. Department of Surgery , Breast Oncology, , Osaka , Japan
7. National Hospital Organization Osaka National Hospital , Breast Oncology, , Osaka , Japan
8. Department of Breast and Endocrine Surgery, Tokai University School of Medicine , Kanagawa , Japan
9. Department of Breast and Endocrine Surgery, Kanagawa Cancer Center , Kanagawa , Japan
10. Chugai Pharmaceutical Co., Ltd. , Tokyo , Japan
11. Department of Breast Oncology, Aichi Cancer Center Hospital , Aichi , Japan