1. Department of Orthopedics, Rush University Medical Center, Chicago, Illinois, USA
2. Department of Surgery, Rush Oak Park Hospital, Oak Park, Illinois, USA
3. Cartilage Restoration Center, Midwest Orthopaedics at Rush, Rush University Medical Center, Chicago, Illinois, USA
4. Chicago Bulls, Chicago, Illinois, USA
5. Chicago White Sox, Chicago, Illinois, USA
6. Department of Orthopaedic Surgery, Duke University Medical Center, Durham, North Carolina, USA
7. College of Veterinary Medicine, Cornell University, Ithaca, New York, USA