S0779 Effect of Ustekinumab Maintenance Therapy on Stool Frequency and Rectal Bleeding Through 2 Years in the UNIFI Phase 3 Study in Ulcerative Colitis. (October 2020) - Abreu, Maria T.; Peyrin-Biroulet, Laurent; Danese, Silvio; Marano, Colleen; Zhou, Yiying; Zhang, Hongyan; Leong, Rupert W. L.; Rowbotham, David; Panaccione, Remo; Sandborn, William J.