1. Department of Orthopaedic Surgery, Markey Cancer Center, University of Kentucky, 740 S. Limestone Avenue, Lexington, KY 40536, USA
2. Department of Orthopaedic Surgery, Mount Sinai Hospital, Toronto, ON, Canada M5G 1X5
3. Department of Orthopaedic Surgery, Duke Cancer Center, Duke University, Durham, NC 27710, USA