1. Department of Cardiology, Hospital de Clínicas, Faculty of Medicine University of the Republic Montevideo Uruguay
2. Servicio de Técnicas Cardíacas y Vasculares No Invasivas Sanatorio Americano Montevideo Uruguay
3. Division of Cardiology Baylor Research Institute Plano TX USA
4. Division of Cardiology, Department of Advanced Biomedical Sciences University Federico II Naples Italy