Received: 12 March 2020
Accepted: 1 May 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: Informed consent forms have been signed by all patients before this study. The research protocol has been approved by the Ethics Committee of The First Affiliated Hospital of Chongqing Medical University and is based on the ethical principles of medical research involving human subjects in the Helsinki Declaration.
: Not applicable.
: The authors report no competing interests in this work.