1. Department of Pathology, Saitama Medical University International Medical Center, Hidaka 350-1298, Saitama, Japan
2. Department of Orthopaedic Surgery, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Chuo 409-3898, Yamanashi, Japan
3. Department of Pathology, Saitama Medical Center, Saitama Medical University, Kawagoe 350-8585, Saitama, Japan
4. Department of Radiology, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Chuo 409-3898, Yamanashi, Japan