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)
Article History
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
: N/A
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.