Adams and Victor's principles of neurology / Allan H. Ropper, MD, Professor of Neurology Harvard Medical School, Associate Neurologist Brigham and Womens Hospital, Deputy Editor, New England Journal of Medicine, Boston, Massachusetts, Martin A. Samuels, MD, MACP, FAAN, FANA, FRCP, DSci (Hon), Miriam Sydney Joseph Distinguished Professor of Neurology, Harvard Medical School, Founding Chair, Department of Neurology, Brigham and Women's Hospital, Massachusetts General Brigham Health Care System, Boston, Massachusetts, Joshua P. Klein, MD, PhD, Associate Professor of Neurology and Radiology, Harvard Medical School, Vice Chair, Clinical Affairs, Department of Neurology, Chief, Division of Hospital Neurology Brigham and Women's Hospital, Boston Massachusetts, Sashank Prasad, MD, Associate Professor of Neurology Harvard Medical School, Vice Chair for Education, Department of Neurology Brigham and Womens Hospital, Program Director, Massachusetts General Brigham Neurology Residency, Boston, Massachusetts.