The Effect of COVID-19 Resurgence on Morbidity and Mortality in Patients With IBD on Biologic Therapy. Issue 8 (9th March 2021) - Markovic, Srdjan; Ivanovski, Tamara Knezevic; Zogovic, Branimir; Kalaba, Ana; Zaric, Dusan; Svorcan, Petar