Footnotes

• XQ and ZL contributed equally.

• Contributors CY and ZL offered administrative and material support and obtained funding; XQ, CY and ZL designed the study; XQ and HL drafted and revised the manuscript; CL, CX and JD acquired the data; JH, YZ, FZ and YZha analysed data; MX, SX and WX interpreted the results. They all participated sufficiently in the work and all approved the final version of the article.

• Competing interests None.

• Patient consent Obtained.

• Ethics approval Ethics committees of Tongji Hospital of Tongji University, Shanghai, China and 302 Hospital of Chinese People's Liberation Army, Beijing, China.

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