1. Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany
2. Biomedical Research in Endstage and Obstructive Lung Disease-Hannover, German Center for Lung Research, Hannover, Germany
3. Cluster of Excellence Regenerative Biology to Reconstructive Therapy, Hannover, Germany
4. Department of Biochemistry and Molecular Biology, Biology and Research Institute-Hospital, Complutense University, Madrid, Spain
5. Department of Neonatology, Eberhard-Karls University, Tübingen, Germany
6. Institute of Functional Anatomy, Charité University of Medicine-Berlin, Berlin, Germany; and
7. German Center for Lung Research, Berlin, Germany