1 Optical and Thermal Mapping Laboratory, Arrhythmia Unit, Cardiovascular Institute, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, Spain.
2 Arrhythmia Unit, Cardiology Department, Hospital Ramón y Cajal, Madrid, Spain.
3 Advanced Development in Arrhythmia Mechanisms and Therapy Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain.