Funding for this research was provided by:
research foundation from the Affiliated Hospital of Southwest Medical University (2015-QS-034)
Text and Data Mining valid from 2019-07-05
Received: 23 November 2018
Accepted: 26 June 2019
First Online: 5 July 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Affiliated Hospital of Southwest Medical University. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Written informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.