1 Dipartimento di Medicina Clinica e Sperimentale, Università di Pisa, Italy.
2 Fourth Unit of Internal Medicine, University Hospital of Pisa, Pisa, Italy.
3 Dipartimento di Medicina Clinica e Sperimentale, Università di Pisa, Italy; Centre for Cardiovascular Preventions and Outcomes, Institute of Cardiovascular Science, University College London, UK. Electronic address: [email protected].