Japanese Foundation for Cancer Research - Department of Breast Surgical Oncology, Fukushima Medical University, Japanese Foundation for Cancer Research - Department of Breast Surgical Oncology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima City Hiroshima Citizens Hospital, National Hospital Organization Nagoya Medical Center, University of Tsukuba Hospital/Ibaraki Prefectural Central Hospital, Hirosaki Municipal Hospital, Gunma Prefectural Cancer Center, Saitama Cancer Center, CHO Kurume General Hospital, Sapporo Kotoni Breast Clinic, Japanese Foundation for Cancer Research - Department of Breast Surgical Oncology, Kansai Rosai Hospital, Osaka International Cancer Institute, University of Occupational and Environmental Health, Juntendo University and National Cancer Center Hospital East