Received: 30 June 2019
Accepted: 31 March 2020
First Online: 20 April 2020
Ethics approval and consent to participate
: The study was conducted in compliance with the Helsinki Declaration and in accordance with local legislation, was approved by the Ethics Committee of First Affiliated Hospital, Dalian Medical University. (Ethics References No: YJ-KY-FB-2019-01). Written informed consent was obtained from all of the patients or their relatives before the procedure.
: Not applicable.
: The authors declare that they have no competing interests.