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