1 Department of Cardiology, Institute of Heart Sciences (ICICOR), Hospital Clínico Universitario de Valladolid, Av. Ramón y Cajal, 3, Valladolid 47005, Spain s.i.llerena.butron@gmail.com.
2 Department of Cardiology, Institute of Heart Sciences (ICICOR), Hospital Clínico Universitario de Valladolid, Av. Ramón y Cajal, 3, Valladolid 47005, Spain.