1. Department of Postgraduate Medicine University of Hertfordshire Hatfield UK
2. Cardiology Department Lister Hospital East and North Hertfordshire NHS Trust Stevenage UK
3. Cardiology Department Royal Papworth Hospital NHS Foundation Trust Cambridge UK
4. Department of Cardiology and Internal Medicine Collegium Medicum Nicolaus Copernicus University Bydgoszcz Poland
5. Division of Cardiology Department of Medicine II Medical University of Vienna Vienna Austria
6. National Heart & Lung Institute Imperial College London UK