Funding for this research was provided by:
The First Affiliated Hospital of Xinxiang Medical University (QN-2017-A009, xyyfy2014BS-006)
Received: 15 October 2019
Accepted: 17 March 2020
First Online: 25 May 2020
Ethics approval and consent to participate
: The project was approved by the Ethics Committee of the First Affiliated Hospital of Xinxiang Medical University. Informed written consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.