Text and Data Mining valid from 2019-12-01
Received: 22 September 2019
Accepted: 1 December 2019
First Online: 18 December 2019
Ethics approval and consent to participate
: All participants provided their written informed consent to participate in this study. The study protocol was approved by Ethics Committee of Hunan Provincial People’ Hospital (2018–37).
: Not applicable.
: Authors declare no conflicts of interest for this article.