1. Cardiac Medicine; National Heart and Lung Institute; Imperial College London, Dovehouse Street London SW3 6LY UK
2. Division of Cardiology; Vestfold Hospital; Toensberg Norway
3. SOCAR Research; Nyon Switzerland
4. Department of Biostatistics and Epidemiology, School of Public Health, Medical and Health Sciences Centre; University of Debrecen; Debrecen Hungary
5. Department of Epidemiology and Biostatistics; Erasmus Medical Centre; Rotterdam The Netherlands