1 Department of Cardiology - Electrophysiology, University Heart & Vascular Centre, University Hospital Hamburg-Eppendorf, Germany; DZHK (German Center for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany.
2 Department of Cardiology, Asklepios Klinik St. Georg, Lohmühlenstr. 5, 20099 Hamburg, Germany. Electronic address: n.gosau@asklepios.com.