Change of right heart size and function by long-term therapy with riociguat in patients with pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension - Marra, Alberto M.; Egenlauf, Benjamin; Benjamin, Nicola; Fischer, Christine; Eichstaedt, Christina; Nagel, Christian; Grünig, Ekkehard (International journal of cardiology, 2015)