1 Department of Health Sciences, Magna Graecia University of Catanzaro, Catanzaro, Italy - l.abenavoli@unicz.it.
2 Department of Health Sciences, Magna Graecia University of Catanzaro, Catanzaro, Italy.
3 Department of Internal Diseases, Federal State Budgetary Educational Institution of Higher Education, Volgograd State Medical University, Volgograd, Russia.