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The paper doesn't adresss any possible difference of PE prevalence between patients with only an elevated D-dimer, high Wells' score alone (admittedly a small group), or both. Is it a false assumption to read into this that such differences were not seen? In other words- how common was PE amongst patients with an elevated D-diner but low risk Wells' score. It would be nice to see the independent and combined value of these two components in predicting pulmonary embolism. I'm curious to know if Dr. Prandoni can elaborate here.