Matuschek, Christiane
Haussmann, Jan
Bölke, Edwin
Gripp, Stephan
Schuler, Patrick J.
Tamaskovics, Bálint
Gerber, Peter Arne
Djiepmo-Njanang, Freddy-Joel
Kammers, Kai
Plettenberg, Christian
Anooshahr, Bahar
Orth, Klaus
Budach, Wilfried
Article History
Received: 13 June 2018
Accepted: 14 September 2018
First Online: 4 October 2018
Ethics approval and consent to participate
: There was no ethics approval necessary because in this meta-analysis we were pulling numbers from the published manuscripts and pooling results.
: Not applicable because in this meta-analysis we were pulling numbers from the published manuscripts and pooling results.
: The authors declare that they have no competing interests.
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