1 Department of Pulmonary Medicine, Paracelsus Medical University, Salzburg, Austria.
2 Department of Pulmonology, Kepler University Hospital, Linz, Austria; Faculty of Medicine, Johannes-Kepler-University, Salzburg, Austria; Institute of General Practice, Family Medicine and Preventive Medicine, Paracelsus Medical University, Portland, OR. Electronic address: andreas.horner@kepleruniklinikum.at.
3 Oregon Health & Science University, Linz, Austria.
4 Department of Pulmonology, Kepler University Hospital, Linz, Austria; Faculty of Medicine, Johannes-Kepler-University, Salzburg, Austria.