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Kucher, Nils; Walpoth, Nazan; Wustmann, Kerstin; Noveanu, Markus; Gertsch, Marc (2003). QR in V1 – an ECG sign associated with right ventricular strain and adverse clinical outcome in pulmonary embolism. European Heart Journal, 24(12), pp. 1113-1119. Oxford University Press 10.1016/S0195-668X(03)00132-5