Article History
Received: 27 May 2020
Accepted: 1 July 2020
First Online: 16 July 2020
Ethics approval and consent to participate
: Informed consent forms were signed by all patients before the study. The research protocol is based on the ethical principles of medical research involving human subjects in the Helsinki Declaration and has been approved by the Ethics Committee of The Affiliated Hospital of Southwest Medical University.
: Not applicable.
: The authors report no competing interests in this work.