PF4 and Venous thrombosis: Abbreviations: Adenoviral vector vaccine (AAV); Bilateral adrenal hemorrhage (BAH); Cerebral venous thrombosis (CVT); Heparin-induced platelet activation assay (HIPA); Mesenteric venous thrombosis (MVT); PF4-induced platelet activation assay (PIPA); Rapid immunoassays (RIA); Serotonin-release assay (SRA); Unusual site thrombosis (UST).