1. Department of Orthopedic Surgery, Musculoskeletal Oncology Service, Massachusetts General Hospital Harvard Medical School Boston Massachusetts USA
2. Department of Orthopaedic Surgery, University Medical Center Groningen University of Groningen Groningen The Netherlands
3. Department of Orthopedic Surgery, Musculoskeletal Oncology Service, Massachusetts General Brigham Hospital Harvard Medical School Boston Massachusetts USA
4. Department of Orthopedic Surgery, Musculoskeletal Oncology Service Boston Children's Hospital Boston Massachusetts USA