Received: 17 April 2019
Revised: 25 August 2019
Accepted: 26 September 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: All the standard procedures were approved by Justus-Liebig-University of Giessen and the local authorities (RP Giessen) regarding animal care and use.
: Not applicable.
: The authors declare that they have no competing interests.