Stankovic, Petar
Wittlinger, Jan
Timmesfeld, Nina
Stephan, Stephan Hoch
Georgiew, Robert
Günzel, Thomas
Teymoortash, Afshin
Wilhelm, Thomas http://orcid.org/0000-0003-1317-5224
Article History
Received: 6 February 2018
Accepted: 18 April 2018
First Online: 20 April 2018
Compliance with ethical standards
:
: All authors have indicated that they have no conflict of interest.
: All procedures performed in this study 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. There was no evaluation or vote of an Ethical Committee necessary because this study was designed as a meta-analysis.