Text and Data Mining valid from 2020-01-07
Received: 1 November 2019
Accepted: 29 December 2019
First Online: 7 January 2020
Ethics approval and consent to participate
: The study protocol was submitted to and approved by the Ethics Committee of the People’s Hospital of Deyang City, the Affiliated Hospital of Southwest Medical University, and Suining Central Hospital. 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.