Risk stratification and prognostic factors in patients with pulmonary arterial hypertension and comorbidities a cross-sectional cohort study with survival follow-up. - Xanthouli, Panagiota; Koegler, Maria; Marra, Alberto M.; Benjamin, Nicola; Fischer, Lukas; Eichstaedt, Christina A.; Harutyunova, Satenik; Nagel, Christian; Grünig, Ekkehard; Egenlauf, Benjamin (Respiratory Research, 2020)