1. Department of Orthopedic Surgery; Nippon Medical School Hospital; Tokyo 113 Japan
2. Center for Regenerative Medicine and Skeletal Development; School of Dental Medicine; University of Rochester School of Medicine; Rochester New York 14642
3. Department of Orthopaedics and Rehabilitation; Center for Musculoskeletal Research; University of Rochester School of Medicine; Rochester New York 14642
4. Department of Orthopaedic Surgery; New England Musculoskeletal Institute; University of Connecticut Health Center; Farmington Connecticut 06030