1 The Italian Orthopaedic Society Bone Metastasis Study Group, Via Nicola Martelli, 3, Rome, 00197, Italy
2 Department of Molecular Medicine and Surgery, Section of Orthopaedics and Sports Medicine, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden
3 Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY, USA