1. Department of Orthopaedic Surgery, School of Medicine, University of California, San Diego, La Jolla, California.
2. Department of Biomedical Engineering, Graduate School of Life and Medical Sciences, Doshisha University, Kyoto, Japan.
3. Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois.
4. Department of Bioengineering, Jacobs School of Engineering, University of California, San Diego, La Jolla, California.
5. Biologics, Nuvasive, Inc., San Diego, California.
6. Department of Radiology, School of Medicine, University of California, San Diego, San Diego, California.