1 Clinical Neurosciences Program, Clinical Neurocardiology Section, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, 9000 Rockville Pike MSC-1620, Building 10 Room 5N220, Bethesda, MD, 20892-1620, USA.
2 Naval Medical Center, Portsmouth, VA, USA.
3 Tel Aviv University Sackler Faculty of Medicine, Tel Aviv, Israel.
4 Chaim Sheba Medical Center, Tel HaShomer, Israel.
5 Clinical Neurosciences Program, Clinical Neurocardiology Section, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, 9000 Rockville Pike MSC-1620, Building 10 Room 5N220, Bethesda, MD, 20892-1620, USA. goldsteind@ninds.nih.gov.