Notes
Ethical Statement: No ethical approval was required as this is
a review article with no original research data.
Data availability statement: The data that support the findings
of this study are available on request from the corresponding author.
Acknowledgement: The authors would like to thank all the study
participants.
Author contributions: Yu Hu and Shanshan Luo designed the
study; Moran Wang and Shengling Ma collected the data, and wrote the
paper; Yu Hu and Shanshan Luo analyzed the data and modified the
grammatical structure of the article; all authors reviewed the paper and
approved the final manuscript.
Potential conflicts of interest:The
authors declare no conflicts of interest.
Funding: This work was supported by the
National
Natural Science Foundation of China (grant number
81601747).