Büttner, Matthias http://orcid.org/0000-0002-7000-8257
Mayer, Anica M.
Büchler, Britta
Betz, Ulrich
Drees, Philipp
Susanne, Singer
Article History
Received: 19 June 2019
Accepted: 28 August 2019
First Online: 11 September 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: No research involving human participants and/or animals was carried out.
: No informed consent was obtained, due to the nature of the study being a systematic review.
: This article does not contain any studies with human participants or animals performed by any of the authors.