1. Clinical and Experimental Orthopaedics Laboratory, Department of Surgery, Uniformed Services University, Bethesda, Maryland, USA
2. Orthopaedic Research Group, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, USA
3. Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA