1. Cardiology Department University Hospital La Paz Madrid Spain
2. Cardiology Department University Hospital Ramon y Cajal Madrid Spain
3. Cardiology Department Hospital Arnau de Vilanova Valencia Spain
4. Cardiology Department Hospital Son Llàtzer, Palma de Mallorca Baleares Spain
5. Cardiology Department University Hospital Fundación Alcorcón Madrid Spain
6. Cardiology Department Hospital San Pedro de Alcántara Caceres Spain
7. Cardiology Department Complejo Hospitalario de Jaen Spain
8. Centro Cochrane Iberoamericano Institut d'Investigació Biomèdica Sant Pau CIBERESP Barcelona Spain