Extensive pulmonary perfusion defects compatible with microthrombosis and thromboembolic disease in severe Covid-19 pneumonia. Issue 196 (December 2020) - Beenen, L.F.M.; Bos, L.D.; Scheerder, M.J.; Lobé, N.H.J.; Muller, M.C.A.; Schultz, M.J.; van den Aardweg, J.G.; Goorhuis, A.; Bonta, P.I.; Middeldorp, S.; Vlaar, A.P.