Received: 8 July 2020
Accepted: 18 November 2020
First Online: 16 December 2020
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee of the Ärztekammer Mecklenburg-Vorpommern (Reg. Nr.III UV 15/08) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable.
: All authors declare that they have no competing interests.