Article History
Received: 14 March 2019
Accepted: 22 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: The Zhengzhou University institutional research committee approved our study, and all participants signed an informed consent agreement for medical research before initial treatment. All related procedures were consistent with Ethics Committee regulations.
: Not applicable.
: The authors declare that they have no competing interests.