Funding for this research was provided by:
National Natural Science Foundation of China (81473547)
National Natural Science Foundation of China (81673829)
Received: 12 October 2017
Accepted: 19 March 2018
First Online: 3 April 2018
Ethics approval and consent to participate
: Ethical approval was not necessary in the current meta-analysis because our meta-analysis only gathered RCTs from a literature search; hence, this procedure did not require any personal data and did not harm any patient.
: Not applicable.
: The authors declare that they have no competing interests.
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