1. Department of Cardiovascular Research; IRCCS-Istituto di Ricerche Farmacologiche “Mario Negri”; Milan Italy
2. Lazio Regional Health Service; Rome Italy
3. Laboratory of Endocrinology; Ospedale Luigi Sacco; Milan Italy
4. ASL Roma D; Rome Italy
5. Roche Diagnostics; Penzberg Germany
6. Department of Cardiovascular Diseases; S. Giovanni-Addolorata Hospital; Rome Italy