1. Cardiology Department Clinical University Hospital of Santiago de Compostela Santiago de Compostela Spain
2. Arrhythmia Unit Clinical University Hospital of Santiago de Compostela Santiago de Compostela Spain
3. Epidemiology Deparment Clinical University Hospital of Santiago de Compostela Santiago de Compostela Spain
4. Unit of Biostatistics Department of Statistics, Mathematical Analysis, Faculty of Mathematics (USC) Santiago de Compostela Spain