S573 Changes in Gastroenterologists Fear Level During First and Subsequent Endoscopic Procedures Before and After COVID-19 Vaccination: Results From a US National Survey. (October 2021) - Al Shabeeb, Reem Q.; Lee, Esther; El Shatanofy, Muhammad; Pashai, Erika; Benjenk, Ivy; Sherman, Marian; Heinz, Eric; Yamane, David; Borum, Marie L.