1 Gastroenterology Unit. Santo Spirito Hospital, Rome, Italy. paolo.fedeli@aslroma1.it.
2 Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy. antonio.sciurti@uniroma1.it.
3 Gastroenterology Unit, Nuovo Regina Margherita Hospital, Rome, Italy. angelo.zullo@aslroma1.it.
4 Department of Prevention, Local Health Unit Roma 1, Rome; Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy. alessandra.sinopoli@aslroma1.it.
5 Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy. valentina.baccolini@uniroma1.it.