Funding for this research was provided by:
Scientific Research Fund of Yunnan Provincial Department of Education (NO. 2017zzx201)
Teaching and Reform Program of Kunming Medical University (NO. 2017-JY-Y-040)
Text and Data Mining valid from 2019-08-14
Received: 26 January 2019
Accepted: 9 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: This study was approved by Ethics Committee of the First Affiliated Hospital Kunming Medical University, and conformed to the declaration of Helsinki. Written informed consent was obtained from each subject.
: Not applicable.
: The authors declare that they have no competing interests.