1. Department of Orthopaedics and Rehabilitation, Vanderbilt University Medical Center, Nashville, Tennessee.
2. Center for Bone Biology, Vanderbilt University Medical Center, Nashville, Tennessee.
3. Section of Orthopaedic and Spinal Surgery, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
4. Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee.
5. Department of Veterans Affairs, Tennessee Valley Healthcare System, Nashville, Tennessee.