1. Biomedical Department of Internal Medicine and Medical Specialties, University of Palermo, Palermo, Italy
2. Department of Population Health, Euro-Mediterranean Institute of Science and Technology, Palermo, Italy
3. Second Propedeutic Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, Hippokration Hospital, Thessaloniki, Greece
4. Department of Clinical Biochemistry, Sultan Qaboos University Hospital, Muscat, Oman