1. Epidemiology, Biostatistics and Prevention Institute; University of Zürich; Zurich Switzerland
2. Department of Preventive Cardiology and Sports Medicine; University Clinic for Cardiology; Inselspital; University Hospital; Berne Switzerland
3. Department of Clinical Research; University and Inselspital Berne; Berne Switzerland
4. Medical University Center Maastricht, Cardiology; University of Maastricht; Maastricht The Netherlands