1. Department of Orthopedic Surgery; Osaka Medical College; 2-7 Daigakumachi Osaka 569-8686 Japan
2. Department of Orthopedic Surgery; Rakusai Shimizu Hospital; 13-107 Oekutsukakecho Nishikyo-ku Kyoto 610-1106 Japan
3. Department of Molecular and Experimental Medicine; The Scripps Research Institute; 10550 North Torrey Pines Road La Jolla California 92037