1. Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania.
2. Department of Neurological Surgery, University of California San Francisco, San Francisco, California.
3. Department of Radiology, University of California San Francisco, San Francisco, California.
4. Department of Public Health, Centre for Medical Decision Making, Erasmus Medical Center, Rotterdam, The Netherlands.
5. Department of Neurosurgery, Antwerp University Hospital, Edegem, Belgium.
6. Seton Brain and Spine Institute, Austin, Texas.
7. Department of Rehabilitation Medicine, Mount Sinai School of Medicine, New York, New York.
8. Division of Anaesthesia, University of Cambridge, Addenbrooke's Hospital, Cambridge, United Kingdom.
9. Department of Psychology, University of Texas, Austin, Texas.