Funding for this research was provided by:
National Institute of Diabetes and Digestive and Kidney Diseases (R15DK114740)
Deutsche Forschungsgemeinschaft (KY96/1-2, Wi-945/17-1)
Received: 6 September 2019
Accepted: 7 September 2019
First Online: 15 October 2019
Ethics approval and consent to participate
: Animal care and all additional procedures were performed according to the institutional animal care committee guidelines and the German animal welfare laws and approved under the reference numbers 84–02.05.20.13.042, 84–02.04.2015.A378 and UniKoeln_Anziege§4.16.020 and §4.17.025 of the LANUV (Landesamt für Natur, Umwelt und Verbraucherschutz NRW) state agency of North-Rhine-Westphalia.
: Not applicable.
: The authors declare that they have no competing interests.