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JY and XL contributed equally
Contributors PL and MG had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: PL, JY, MG. Acquisition of data: PL, JY, XL, QT, X-lY, Z-gC, Z-yH and MG. Analysis and interpretation of data: PL, JY, MG. Drafting of the manuscript: JY. Critical revision of the manuscript for important intellectual content: JY, XL.
Funding This work was supported by one grant 7144246 from the Beijing Natural Science Foundation, and two grants 81401436 and 81430039 from the National Scientific Foundation Committee of China.
Competing interests None declared.
Patient consent Obtained.
Ethics approval Ethics committee of Chinese PLA general hospital.
Provenance and peer review Not commissioned; internally peer reviewed.