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GM, YG and DG contributed equally to this work. ZZ and MW co-supervised this work.
Twitter Follow Yuqiu Ge at @gutjnl-2015-311299
Contributors ZZ and MW are co-responders for this paper. Study concept and design: MW and GM. Acquisition of data: GM and YG. Analysis and interpretation of data: MD, DG and HC. Drafting of the manuscript: GM and YG. Critical revision of the manuscript for important intellectual content: ZZ, MW and JC. Statistical analysis: GM and YG. Obtained funding: ZZ and MW. Approval of the final version of the manuscript: MW and ZZ.
Funding This study was partly supported by National Natural Science Foundation of China (81373091, 81230068 and 81201570), Distinguished Young Scholars of Nanjing (JQX13005) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (Public Health and Preventive Medicine).
Competing interests None declared.
Patient consent Obtained.
Provenance and peer review Not commissioned; internally peer reviewed.