1. Department of Neurosurgery, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Ortopedico Galeazzi, Milan, Italy,
2. Pathology Unit, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) San Raffaele Scientific Institute, Milan, Italy,
3. University of Basel, Basel, Switzerland,
4. Department of Spine Surgery, Swiss Paraplegic Center, Nottwil, Switzerland.
5. Department of Anesthesia, Surgical Intensive Care, Preclinical Emergency Medicine and Pain Therapy, University Hospital Basel, Basel, Switzerland.