Widmann, Bernhard http://orcid.org/0000-0001-8909-9083
Warschkow, Rene
Beutner, Ulrich
Weitzendorfer, Michael
Ukegjini, Kristjan
Schmied, Bruno M.
Tarantino, Ignazio
Steffen, Thomas
Article History
Received: 9 January 2020
Accepted: 31 March 2020
First Online: 26 May 2020
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.
: This literature review and meta-analysis only used anonymous data from already published studies so no informed consent could be obtained.