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Footnotes
CY and MZ contributed equally.
Contributors GJ designed the study and critically revised the manuscript for important intellectual content. MZ provided technical and data support. TH and FY performed data analysis. CY analysed data and wrote the manuscript.
Funding This work was supported by the national key research and development program of China (grant no. 2016YFC1302703); the national natural science foundation of China (grant nos. 81422042, 81373090); the key grant of natural science foundation of Jiangsu higher education institutions (grant no 15KJA330002); the Top-notch academic programs project of Jiangsu higher education institution (grant no. PPZY2015A067); and the priority academic program for the development of Jiangsu higher education institutions (public health and preventive medicine).
Competing interests None declared.
Patient consent Obtained.
Ethics approval Institutional Review Board of Nanjing Medical University.
Provenance and peer review Not commissioned; externally peer reviewed.