1. Department of Breast and Endocrine Surgery, Kanagawa Cancer Center, Yokohama, Kanagawa 241‑8515, Japan
2. Department of Surgical Treatment, Yokohama City University Hospital, Yokohama, Kanagawa 236‑0004, Japan
3. Department of Breast and Thyroid Surgery, Yokohama City University Medical Center, Yokohama, Kanagawa 232‑0024, Japan