Matthias Ochs1,2, Julia Schipke3,4. 1. Institute of Functional Anatomy, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt Universität Zu Berlin, Philippstr. 11, 10115, Berlin, Germany. matthias.ochs@charite.de. 2. German Center for Lung Research (DZL), Berlin, Germany. matthias.ochs@charite.de. 3. Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany. 4. Biomedical Research in Endstage and Obstructive Lung Disease, Member of the German Center for Lung Research (DZL), Hannover, Germany.