1 Department of Translational Medical Sciences, "Federico II" School of Medicine and University Hospital, Naples, Italy. Electronic address: alberto_marra@hotmail.it.
2 Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA.
3 Cardiovascular Disease Unit, IRCCS Ospedale Policlinico San Martino, Department of Internal Medicine, University of Genova, Genova, Italy.
4 Department of Public Health, "Federico II" University of Naples, Naples, Italy.