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Geersing G, Erkens P M G, Lucassen W A M, Büller H R, Cate H t, Hoes A W et al.
Safe exclusion of pulmonary embolism using the Wells rule and qualitative D-dimer testing in primary care: prospective cohort study
BMJ 2012; 345 :e6564
doi:10.1136/bmj.e6564