1. Dipartimento di Medicina Clinica e Sperimentale, University of Sassari, Sassari, Italy;
2. Sardinia Longevity Blue Zone Observatory, Ogliastra, Italy;
3. Azienda Ospedaliero-Universitaria, Sassari, Italy;
4. Michael E. DeBakey VA Medical Center and Baylor College of Medicine, Houston, TX, USA