1. Centro Cardiologico Monzino, Istituti di Ricovero e Cura a Carattere Scientifico (IRCCS), 20138 Milan, Italy
2. Regional Epidemiological Observatory, Lombardy Region, 20138 Milan, Italy
3. Manzoni Hospital, 23900 Lecco, Italy
4. Cardiovascular Section, Department of Clinical Sciences and Community Health, University of Milan, 20138 Milan, Italy