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THM, WL and XL contributed equally.
Contributors THM, WL, RG, WXW, XL and PW conceived and designed the study; WL, THM, YS, YH and LH carried out the statistical analysis and drafted the manuscript. THM wrote the first draft of the paper. HHM and WLS contributed to revising it and producing the final draft of the manuscript, interpreted results and ensure data acquisition and management. All authors have approved the final version for publication.
Funding This study was funded by Jiangsu Provincial Social Science Foundation, grant number 13TYA001.
Competing interests None declared.
Patient consent Obtained.
Ethics approval The protocol was approved by the Research Ethics Committee of the Students’ Health Literacy Promotion and Research office in Jiangsu Province, and School of Public Health, Southeast University, Jiangsu Province, China.
Provenance and peer review Not commissioned; internally peer reviewed.