Funding for this research was provided by:
Science Research Project of Inner Mongolia Higher Educational System (NJZZ18155)
Scientific Research Foundation of Affiliated Hospital of Inner Mongolia University for Nationalities (2017QDJJ08)
Text and Data Mining valid from 2019-09-06
Received: 11 February 2019
Accepted: 13 August 2019
First Online: 6 September 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Inner Mongolia University for Nationalities, and the written informed consent was also obtained from each participant in advance.
: Not applicable.
: The authors declare that they have no competing interests.