1. Department of Surgical Specialties, Tokyo Medical and Dental University, Graduate School of Medicine and Dentistry, Bunkyo‑ku, Tokyo 113‑8519, Japan
2. Department of Radiology, Tokyo Medical and Dental University, Graduate School of Medicine and Dentistry, Bunkyo‑ku, Tokyo 113‑8519, Japan
3. Department of Pathology, Tokyo Medical and Dental University, Graduate School of Medicine and Dentistry, Bunkyo‑ku, Tokyo 113‑8519, Japan