Received: 18 May 2020
Accepted: 30 August 2020
First Online: 5 September 2020
Ethics approval and consent to participate
: This study was approved by the Medical Ethics Committee of the Fourth Hospital of Hebei Medical University (2017MEC113) and written informed consent was obtained from all subjects participating in the trial. The trial was registered at the Chinese Clinical Trial Registry (ExternalRef removed, Principal investigator: Li Jia, Date of registration: 2020-01-13).
: Not applicable.
: The authors declare that they have no competing interests.