Affiliation: | 1. Department of Surgery, Surgical Oncology and Science, School of Medicine, Sapporo Medical University, Minami 1-Jo, Nishi 17-Chome, Chuo-ku, Sapporo, Hokkaido, 060-8556, Japan 2. Department of Surgery, Higashi-Sapporo Hospital, Sapporo, Japan 3. Sapporo Breast Surgical Clinic, Sapporo, Japan 4. Sapporo-Kotoni Breast Clinic, Sapporo, Japan 5. Department of Surgery, Muroran City General Hospital, Muroran, Japan
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