Received: 15 July 2020
Accepted: 17 December 2020
First Online: 11 January 2021
Ethics approval and consent to participate
: The original study protocol was approved by the appropriate local authority (Landesamt für Naturund Verbraucherschutz, Recklinghausen, Germany).
: Not applicable.
: The authors Ausra Ramanauskaite, Karina Obreja, Robert Sader, Jürgen Becker, and Frank Schwarz stated explicitly that there are no conflicts of interest related to this article.