Text and Data Mining valid from 2019-06-11
Received: 29 December 2018
Accepted: 22 April 2019
First Online: 11 June 2019
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.
: This is a network-meta-analysis which does not contain any individual persons data, therefore not applicable.
: The authors declare that they have no competing interests.
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