Text and Data Mining valid from 2019-11-15
Received: 7 July 2019
Accepted: 7 November 2019
First Online: 15 November 2019
Ethics approval and consent to participate
: All subjects have given their written informed consent and the study was approved by the ethics committee of The First Affiliated Hospital of Nanchang University. It was conducted according to the standards of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.