Funding for this research was provided by:
Medical Science and Technology Foundation of Guangdong Province (2015B020225007)
Natural Science Foundation of Guangdong Province (2018A0303130206)
Received: 14 October 2019
Accepted: 14 November 2019
First Online: 11 December 2019
Ethics approval and consent to participate
: The review board of the Guangdong Provincial People's Hospital approved the whole research plan.
: All authors reviewed the final version of the manuscript and approved it for submission.
: The authors declare that they have no competing interests.