Article History
Received: 18 April 2018
Accepted: 4 July 2018
First Online: 13 July 2018
Compliance with ethical standards
:
: The authors declare that they have 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. According to the rules of the ethics committee at the University Hospital of the J.W. Goethe University at Frankfurt/Main, due to anonymity no ethics vote was necessary.