Karen M Olsson1, Jan C Kamp2, Marius M Hoeper3. 1. Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany; Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), German Center of Lung Research (DZL), Germany. Electronic address: olsson.karen@mh-hannover.de. 2. Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany. 3. Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany; Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), German Center of Lung Research (DZL), Germany.