2.1. Study registration

JX Jun Xiong
TY Ting Yuan
QH Qiaotong Huang
XW Xue Wang
JY Jun Yang
YJ Yunfeng Jiang
XZ Xiaohong Zhou
KL Kai Liao
LX Lingling Xu
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This systematic review and meta analysis will be performed according to the guidelines of the Cochrane Handbook for Systematic Reviews and Meta-Analysis Protocol (PRISMA-P).[21] The protocol was beforehand registered in PROSPERO 2019 CRD42019141113. And it could be found from http://www.crd.york.ac.uk/PROSPERO/display_record.php?ID=CRD42019141113.

Any changes in the standard protocol will be described further.

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