1. Steadman Philippon Research Institute, Center for Regenerative Sports Medicine, 181 W. Meadow Dr, Vail, CO, USA
2. Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, JP, Japan
3. Department of Bioengineering, Colorado State University, 225 Scott Bioengineering Building, Fort Collins, CO 80523, USA
4. University of California San Francisco, Orthopaedic Trauma Institute, 1500 Owens Street, San Francisco, CA 94158, USA
5. Department of Orthopedic Surgery, Columbia University, Irving Medical Center, New York Presbyterian Hospital, 622 W 168th St, New York, NY, USA
6. Department of Orthopaedic Surgery, McGovern Medical School, University of Texas Health Science Center at Houston, 7000 Fannin St, Houston, TX 77030, USA