1. Department of Signal Theory and Communications and Telematic Systems and Computation, Rey Juan Carlos University, Spain
2. Department of Communication Engineering, Miguel Hernández University, Spain
3. Unidad de Arritmias, Hospital Clínico Universitario Virgen de la Arrixaca, Spain
4. Department of Signal Theory and Communications and Telematic Systems and Computation, Rey Juan Carlos University, Fuenlabrada, Madrid, Spain