1. Department of Orthopedic Surgery, Shinshu University School of Medicine, 3-1-1 Asahi Matsumoto, Nagano 390-8621, Japan, Institute for Oral Science, Department of Biochemistry, Department of Anatomy, Matsumoto Dental University, 1780 Hiro-oka Gobara, Shiojiri, Nagano 390-0781, Japan, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan, and Department of Applied Physical Therapy, Shinshu University School of Health Science, 3-1-1 Asahi Matsumoto, Nagano 390-8621, Japan