Funding for this research was provided by:
Natural Science Foundation of Jiangsu Province (BK20160064)
National Natural Science Foundation of China (31802222)
National Key Research and Development Program of China (2017YFD0500804)
Text and Data Mining valid from 2019-02-26
Received: 6 April 2018
Accepted: 24 January 2019
First Online: 26 February 2019
Ethics approval and consent to participate
: Ethical approval has been granted by the Institute of Health Research Ethics committee, IHR reference: IHREC812
: The authors declare that they have no competing interests.
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