DIAS, Emanuel et al. Primary Myelofibrosis in the Prefibrotic Stage Presenting as Portal, Splenic, and Superior Mesenteric Vein Thrombosis: A Case Report and Review of the Literature. GE Port J Gastroenterol [online]. 2022, vol.29, n.2, pp.49-55.  Epub Sep 15, 2022. ISSN 2341-4545.