Footnotes

• JL and CL contributed equally.

• Contributors YJ, FP and YC contributed to the conception and design of this study. JL, ML, YW, XX and LY collected and organised the data. CL, JL, YJ and YC analysed the data. JL, YJ, CL, FP, YC and BQ drafted the manuscript. YJ, FP and YC reviewed the whole paper, figures and tables. All the authors read and approved the final manuscript. * YJ and FP contributed equally to this paper.

• Funding This work was supported by the National Natural Science Foundation of China (81671182) and the Natural Science Foundation of Guangdong Province (2016A030313228), and Cultivation Project of the National Natural Science Foundation of China (2020GZRPYQN27). The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.

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