Received: 10 June 2020
Accepted: 20 September 2020
First Online: 18 January 2021
Ethics approval and consent to participate
: Approved by the ethical committee of the Lower Saxony State Office for Consumer Protection and Food Safety according to the German animal welfare act (approval number 33.12-42502-04-14/1733).
: Not applicable.
: The authors declare that they have no competing interests.