Text and Data Mining valid from 2020-04-28
Received: 14 February 2020
Accepted: 3 April 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of Wuhan University, and all data included in the analysis were anonymized.
: The manuscript was reviewed and approved by all authors.
: The authors declare that there are no conflicts of interest.