1. School of Medicine, Lund University, Lund, Sweden
2. The Miami Project to Cure Paralysis, Department of Neurosurgery, University of Miami Miler School of Medicine, Miami, Florida, FL 33136, United States
3. Department of Neurological Surgery, Vanderbilt University School of Medicine, Nashville, Tennessee, United States
4. Department of Emergency and Critical Care Medicine, Division of Neurological Emergency Nippon Medical School, Tokyo, Japan