1. Department of Cardiology, University Hospital Universitario La Paz, Madrid, Spain
2. Department of Cardiology, University Hospital Ramón y Cajal, Madrid, Spain
3. Department of Cardiology, Hospital San Pedro de Alcántara, Cáceres, Spain
4. Department of Cardiology, Hospital Arnau de Vilanova, Valencia, Spain
5. Department of Cardiology, University Hospital Virgen de la Arrixaca, Murcia, Spain
6. Department of Cardiology, Hospital Santa Creu i Sant Pau, Barcelona, Spain