Fig 1. Flowchart of study population, showing (A) cohorts and (B) further details of the systematic screening cohort.
1D-dimer cut-off ≥ 500 ug/L if ≥ 1 YEARS items; D-dimer cut-off is increased to 1000 ug/L if 0 YEARS items. ED, emergency department; CTPA; computed tomography pulmonary angiogram; PE, pulmonary embolism.
