Funding for this research was provided by:
National Basic Research Program of China (973 Program) (2016YFC0904503)
Hospital level fund of the second hospital of Hebei medical university (2h2019019)
Received: 10 October 2019
Accepted: 13 July 2020
First Online: 25 July 2020
Ethics approval and consent to participate
: The present study was approved by the Ethics Committee of the Second Hospital of Hebei Medical University (Hebei, China), and a written informed consent was obtained from each patient or their legal surrogates.
: Not applicable.
: All authors declare that there is no conflict of interest in this work.