1. Department of Rhythmology, University Heart Center Lübeck, University Hospital Schleswig-Holstein , Ratzeburger Allee 160, Lübeck D-23538 , Germany
2. German Center for Cardiovascular Research (DZHK) , Partner Site Hamburg/Kiel/Lübeck, Lübeck , Germany
3. Division of Cardiology, Internal Medicine III, Hamamatsu University Hospital , 1-20-1 Handayama, Higashi-ku, Hamamatsu city, Shizuoka 431-3192 , Japan
4. LANS Cardio , Stephansplatz 5, Hamburg 20354 , Germany