CHEN, Jie; HANG, Ying. Characteristics, risk factors and outcomes of gastrointestinal hemorrhage in COVID-19 patients: A meta-analysis. Pakistan Journal of Medical Sciences, [S. l.], v. 37, n. 5, 2021. DOI: 10.12669/pjms.37.5.4351. Disponível em: https://www.pjms.org.pk/index.php/pjms/article/view/4351. Acesso em: 12 may. 2026.