1. Service of Biometry and Clinical Epidemiology; Fondazione IRCCS Policlinico San Matteo; Pavia Italy
2. Scientific Documentation Center; Scientific Direction Fondazione IRCCS Policlinico San Matteo; Pavia Italy
3. Division of Cardiology; Fondazione IRCCS Policlinico San Matteo; Pavia Italy
4. Division of Cardiology; Fondazione Cardiocentro Ticino; Lugano Switzerland