1. Department of Orthopedic Surgery, Nihon University Hospital, Chiyoda‑ku, Tokyo 101‑8309, Japan
2. Department of Orthopedic Surgery, Nihon University School of Medicine, Itabashi‑ku, Tokyo 173‑8610, Japan
3. Department of Internal Medicine, Nihon University School of Medicine, Itabashi‑ku, Tokyo 173‑8610, Japan
4. Department of Orthopedic Surgery, Tachikawa Kinen Hospital, Kasama City, Ibaraki 309‑1736, Japan