1. Ultrasuoni Srl, Medical Center, Catania, Italy
2. Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, Messina, Italy
3. Department of Economics, Business and Statistics, University of Palermo, Palermo, Italy
4. Department of Infectious Diseases and Tropical Medicine, AOU Policlinico ‘G. Rodolico – San Marco’, Catania, Italy
5. Gastroenterology and Hepatology Unit, Department of Health Promotion Sciences Maternal and Infantile Care, Internal Medicine and Medical Specialities, PROMISE, University of Palermo, Palermo, Italy