Funding for this research was provided by:
China Scholarship Council (NA)
Received: 16 August 2019
Accepted: 20 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: The study has been reviewed and approved by the School of Medicine Research Ethics Committee at the University of Leeds (reference number: MREC17–021).
: Not applicable.
: The authors declare that they have no competing interests.