Received: 28 April 2020
Accepted: 1 September 2020
First Online: 10 September 2020
Ethics approval and consent to participate
: This study conforms to the ethical guidelines in a priori approval by the local Ethical Committee of the Hebei General Hospital. <b>This study was approved by our institutional review board (IRB number 20191205).</b>
: Not applicable.
: The authors declare that they have no competing interests.