S577 Gastroenterologists' Perceptions of Adequacy of PPE During the COVID Pandemic: 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.