1 Department of Clinical and Biological Sciences, University of Torino, Turin (Italy); paola.berchialla@unito.it.
2 Unit of Biostatistics, Epidemiology and Public Health, Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padova, Padua (Italy).
3 Department of Clinical and Biological Sciences, University of Torino, Turin (Italy).