Department of Neurology Leiden University Medical Centre Leiden, The Netherlands [email protected]

Cardiac Arrhythmia Center Cardiovascular Medicine University of Minnesota Minneapolis, MN.

Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria

Department of Cardiology, Skåne University Hospital; and Department of Clinical, Sciences Lund University, Malmö, Sweden

Department of Internal Medicine, Division of Cardiology, University of Iowa, Iowa City, IA

Department of Cardiac Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary Alberta, Canada

Department of Pediatrics and Physiology, Hypotension Center, New York Medical College, Valhalla, NY

Department of Cardiology, Hammersmith Hospital Campus, National Heart and Lung Institute, Imperial College London, London, United Kingdom

Disclosure: The authors declare no conflict of interest.