Liu, Jinhua
Chen, Hongsheng
Chen, Yang
Li, Zhigang
Funding for this research was provided by:
National Natural Science Foundation of China (41422103, 41771167)
National Natural Science Foundation of China (41501151)
Article History
Received: 29 April 2018
Accepted: 28 August 2018
First Online: 3 September 2018
Ethics approval and consent to participate
: The access to the survey data used in this study was approved by the National Health Commission of the People’s Republic of China. Informed consent was not required because this study did not directly involve human participants as the data had been collected previously in the survey. Consent to participate for patients was not applicable in this study.
: Not applicable.
: The authors declare that they have no competing interests.
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