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APA Citation
Watte, G., Mello, M., Altmayer, S., & Hochhegger, B. (2019). switching from sildenafil to riociguat in patients with persistent or inoperable chronic thromboembolic pulmonary hypertension. International journal of cardiology, 277, 239–. http://access.bl.uk/ark:/81055/vdc_100076797029.0x000040