1 Department of Internal Medicine, Division of Pulmonology, Medical University of Graz, Graz, Austria; Ludwig Boltzmann Institute for Lung Vascular Research, Graz, Austria. Electronic address: gabor.kovacs@klinikum-graz.at.
2 Department of Internal Medicine, Division of Pulmonology, Medical University of Graz, Graz, Austria; Ludwig Boltzmann Institute for Lung Vascular Research, Graz, Austria.
3 Institute for Medical Informatics, Statistics and Documentation, Medical University of Graz, Graz, Austria.