1. Department of Orthopedic Surgery, Boston University Medical Center, Boston, Massachusetts, USA
2. Department of Orthopedic Surgery, Chiba University School of Medicine, Chuo‐ku, Chiba, Japan
3. Department of Orthopedic Surgery, Seoul National University College of Medicine, Chongno‐gu, Seoul, Korea
4. Department of Orthopedic Surgery, Tohoku University School of Medicine Seiryo‐machi, Aoba‐ku, Sendai, Japan
5. Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston, Massachusetts, USA