Caio, G. .; Lungaro, L.; Cultrera, R.; De Giorgio, R. .; Volta, U. Coronaviruses and Gastrointestinal Symptoms: An Old Liaison for the New SARS-CoV-2: Coronaviruses and Gastrointestinal Symptoms. Gastroenterol Hepatol Bed Bench 2020, 13, 341-350.