Funding for this research was provided by:
National Natural Science Foundation of China (71303058, 71003025, 71373004)
Changjiang Scholar Program of Chinese Ministry of Education (IRT_13R11, IRT0912)
National Science Foundation for Distinguished Young Scholars of China (79925002)
Specialized Research Fund for the Doctoral Program of Higher Education from Ministry of Education of China (20120071110055)
the Fourth Round of Three-Year Pubic Health Action Plan in Shanghai (GWIV-32)
the Program of National Social Science Fund of China (13AZD081)
the Fundamental Research Funds for the Central Universities (20520163035)
Text and Data Mining valid from 2018-04-11
Received: 28 April 2017
Accepted: 8 March 2018
First Online: 11 April 2018
Ethics approval and consent to participate
: The study was approved by the Medical Research Ethics Committee at the School of Public Health of Fudan University. The access to the survey data used in this study was approved by the National Health Commission of the People’s Republic of China (the former Ministry of Health). This study didn’t involve human participants and there was no data collected from humans or animals. Consent to participate for patients were not applicable.
: Not applicable.
: The authors declare that they have no competing interests.
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