1 Institute of Functional and Applied Anatomy, Hannover Medical School, Member of the German Center for Lung Research (DZL), Hannover, Germany.
2 Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), Hannover, Germany.
3 Department of Pathology and Laboratory Medicine, University of Vermont, Burlington, VT, 05405, USA. douglas.taatjes@med.uvm.edu.
4 Microscopy Imaging Center, Larner College of Medicine, University of Vermont, Burlington, VT, 05405, USA. douglas.taatjes@med.uvm.edu.