1. Diagnostic and Interventional Radiology, IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy
2. Radiology Department, IRCCS Azienda Ospedaliero-Universitaria Sant’Orsola Malpighi, 40138 Bologna, Italy
3. Neuroradiology, IRCCS Istituto delle Scienze Neurologiche di Bologna, 40139 Bologna, Italy
4. Spine Surgery Unit, IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy
5. 1st Orthopaedic and Traumatologic Clinic, IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy
6. Department of Imaging, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA