1. Academic Neurosurgery Unit, St. George's, University of London, London, United Kingdom.
2. Neuro Anesthesia and Neuro Intensive Care Unit, St. George's Hospital, London, United Kingdom.
3. Department of Neurology and Experimental Neurology, Spinal Cord Injury Research (Neuroparaplegiology), Charité - Universitätsmedizin Berlin, Berlin, Germany.
4. The Belford Center for Spinal Cord Injury, The Ohio State University, Wexner Medical Center, Columbus, Ohio, USA.
5. Departments of Neurology, Physical Medicine and Rehabilitation, and Neurosciences, The Ohio State University, Columbus, Ohio, USA.