1. Catalan Institute of Cardiovascular Sciences; St. Pau Hospital; Barcelona Spain
2. Heart Rhythm Service; Kingston General Hospital; Queen's University; Kingston ON Canada
3. Cardiology Department; Hospital Universitario Gregorio Marañón; Universidad Europea; Universidad Complutense; Madrid Spain
4. Center for Integrative Electrocardiology at Lund University (CIEL), and Arrhythmia Clinic Sweden; Skåne University Hospital; Lund Sweden