1. Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
2. Department of Orthopaedic Surgery, Guthrie Robert Packer Hospital, Sayre, Pennsylvania, USA
3. Department of Orthopaedic Surgery, American University of Beirut, Beirut, Lebanon
4. Department of Oncology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
5. Department of Radiation Oncology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA