Funding for this research was provided by:
Natural Science Foundation of Xizang (Tibet) Autonomous Region (XZ2019ZRG-ZY60(Z))
Article History
First Online: 22 November 2020
Declarations
:
: This study was funded by Natural Science Foundation of Xizang (Tibet) Autonomous Region [XZ2019ZRG-ZY60(Z)].
: Xiaoyang Li, Yu Zheng, and Fei Yue declare that they have no conflicts of interest that might be relevant to the contents of this article.
: Not applicable.
: Not applicable.
: Not applicable.
: All datasets presented in this study are included in the article/supplementary material.
: Not applicable.
: XL and YZ conceived the study and designed the protocol. XL and YZ performed the literature search. YZ and FY selected the studies and extracted the relevant information. XL and YZ synthesized the data. FY wrote the first draft of the paper. All authors critically revised successive drafts of the paper and approved the final version.