Article History
Received: 13 June 2020
Accepted: 12 September 2020
First Online: 24 September 2020
Compliance with ethical standards
:
: All authors declare no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. A positive ethics vote from the University of Freiburg i.Br, Germany, was given (No. 161/20).
: Informed consent was obtained from all individual participants included in the study.