Prevalence and predictive factors associated with positivity of Sars-Cov-2 serological markers in patients with inflammatory bowel disease at an ibd referral center - Ferreira, Sandro da Costa; Parra, Rogério Serafim; Feitosa, Marley Ribeiro; Feres, Omar; Santana, Rodrigo de Carvalho; Troncon, Luiz Ernesto de Almeida (Arquivos de Gastroenterologia, 2022)