1. Department of Neurology, Mayo Clinic, Rochester, Minnesota, USA.
2. Department of Anesthesiology, Duke University Hospital, Durham, North Carolina, USA.
3. Department of Anesthesiology and Critical Care, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
4. Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, Minnesota, USA.
5. Department of Physical Medicine and Rehabilitation, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA.
6. Department of Neurology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA.
7. Department of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA.
8. Palliative and Advanced Illness Research Center, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
9. Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA.
10. Department of Anesthesiology, University of Colorado School of Medicine, Aurora, Colorado, USA.