1. Department of Cardiology; Hospital Universitario Fundación Jiménez Díaz-quirónsalud, Universidad Autónoma de Madrid; Avenida Reyes Católicos 2 Madrid 28040 Spain
2. Department of Cardiology; Hospital Alvarez Buylla; Mieres Asturias Spain
3. Department of Cardiology; Hospital Universitario Infanta Leonor; Madrid Spain