1. Department of Human Pathology, School of Medicine, Juntendo University, 1-1-19 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2. Department of Orthopaedic Surgery, School of Medicine, Juntendo University, 1-1-19 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
3. Biotechnical Center, Japan SLC, Inc., 3-5-1 Aoihigashi, Naka-ku, Hamamatsu, Shizuoka 433-8114, Japan