Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (HE 1168/17-1, ME 1833/1-1)
Received: 8 July 2020
Accepted: 22 October 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: All lungs from calves used for these experiments were obtained from local slaughter company in Germany. Study design, including all measures were approved by a local, independent committee on ethics (Commission for ethical estimation of animal research studies of the Lower Saxonian State Office for Consumer Protection and Food Safety (approval number 33.9-42502-05-09A627) and were in accordance with the requirements of the national animal welfare law. Compliance with animal welfare law and ethics were regularly controlled by the local authorities. All experiments were approved by and performed at the University of Veterinary Medicine Hannover (No. 20190415).
: Not applicable.
: The authors declare that they have no competing interests.