Konrad, Peter
Hufnagel, Markus
Berner, Reinhard
Toepfner, Nicole http://orcid.org/0000-0002-9693-4419
Article History
Received: 5 August 2019
Accepted: 20 September 2019
First Online: 22 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in this study were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For this type of study, formal consent is not required.