1. Department of Anesthesiology and Perioperative Care, Mayo Clinic, Rochester, MN 55902, USA
2. School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, USA
3. St George’s University Hospitals NHS Foundation Trust, London SW17 0QT, UK
4. Department of Neurology, University of Pennsylvania, Philadelphia, PA 19104, USA
5. Department of Neurology, University of Missouri, Columbia, MO 65211, USA