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Michael J Schneck, MD, MBA Vice Chair and Professor, Departments of Neurology and Neurosurgery, Loyola University, Chicago Stritch School of Medicine; Associate Director, Stroke Program, Director, Neurology Intensive Care Program, Medical Director, Neurosciences ICU, Loyola University Medical Center

Michael J Schneck, MD, MBA is a member of the following medical societies: American Academy of Neurology, American Society of Neuroimaging, Neurocritical Care Society, Stroke Council of the American Heart Association

Disclosure: Nothing to disclose.

Anna Janss, MD, PhD Associate Professor of Pediatric Neuro-oncology, Emory University School of Medicine; Consulting Neuro-oncologist, Children's Healthcare of Atlanta

Anna Janss, MD, PhD is a member of the following medical societies: American Academy of Neurology, American Association for Cancer Research, American Medical Association, International Association for the Study of Pain, Pennsylvania Medical Society, Society for Neuroscience, Children's Oncology Group, Society for Neuro-Oncology

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Jorge C Kattah, MD Head, Associate Program Director, Professor, Department of Neurology, University of Illinois College of Medicine at Peoria

Jorge C Kattah, MD is a member of the following medical societies: American Academy of Neurology, American Neurological Association, New York Academy of Sciences

Disclosure: Nothing to disclose.

Tarakad S Ramachandran, MBBS, MBA, MPH, FAAN, FACP, FAHA, FRCP, FRCPC, FRS, LRCP, MRCP, MRCS † Professor Emeritus of Neurology and Psychiatry, Clinical Professor of Medicine, Clinical Professor of Family Medicine, Clinical Professor of Neurosurgery, State University of New York Upstate Medical University; Neuroscience Director, Department of Neurology, Crouse Irving Memorial Hospital

Tarakad S Ramachandran, MBBS, MBA, MPH, FAAN, FACP, FAHA, FRCP, FRCPC, FRS, LRCP, MRCP, MRCS is a member of the following medical societies: American Academy of Neurology, American Academy of Pain Medicine, American College of Forensic Examiners Institute, American College of International Physicians, American College of Physicians, American Heart Association, American Stroke Association, National Association of Managed Care Physicians, Royal College of Physicians, Royal College of Physicians and Surgeons of Canada, Royal College of Surgeons of England, Royal Society of Medicine

Disclosure: Nothing to disclose.

Frederick M Vincent, Sr, MD Clinical Professor, Department of Neurology and Ophthalmology, Michigan State University Colleges of Human and Osteopathic Medicine

Frederick M Vincent, Sr, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Neurology, American Association of Neuromuscular and Electrodiagnostic Medicine, American College of Forensic Examiners Institute, American College of Legal Medicine, American College of Physicians

Disclosure: Nothing to disclose.

The authors and editors of Medscape Reference gratefully acknowledge the contributions of previous author Robert Wilson, MD to the development and writing of this article.

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