Funding for this research was provided by:
National Natural Science Foundation of China (71503226, 71603132)
China Postdoctoral Science Foundation (2018M632781)
Guangzhou Science and Technology Program key projects (201704020208)
Central Government Guides the Development of Local Science and Technology Special Fund of China (Z135050009017)
Received: 25 April 2019
Accepted: 24 February 2020
First Online: 4 March 2020
Ethics approval and consent to participate
: All enrolled patients gave written informed consent to the CSS research team. The ethics committee of Henan Provincial People’s Hospital ruled that no formal ethics approval was required in this particular case.
: All authors have read and approved the manuscript.
: The authors declare that they have no competing interests.