Received: 3 October 2018
Accepted: 9 April 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: The study protocol was registered in the International Prospective Register of Systematic Reviews (CRD42018090437).
: We waived the necessity to obtain consent for publication because this study was a network meta-analysis.
: The authors declare that they have no competing interests.
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