Risk stratification and prognostic factors in pulmonary arterial Hypertension and pulmonary arterial Hypertension with comorbidities - Xanthouli, P; Koegler, M; Benjamin, N; Fischer, L; Egenlauf, B; Eichstaedt, C; Harutyunova, S; Marra, AM; Nagel, C; Theobald, V; Grünig, E (Pneumologie, 2020)