1. Departments of Anesthesiology & Critical Care Medicine
2. Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland
3. Physical Medicine & Rehabilitation, Johns Hopkins School of Medicine, Baltimore, Maryland
4. Department of Anesthesiology and Physical Medicine & Rehabilitation, Walter Reed National Military Medical Center, Uniformed Services University of the Health Sciences, Bethesda, Maryland
5. Department of Anesthesiology, Critical Care and Pain Medicine Service, VA Boston Healthcare System, Boston, Massachusetts
6. Department of Edith Nourse Rogers Memorial Veterans Hospital, Harvard Medical School, Bedford, Massachusetts, USA