Funding for this research was provided by:
Science and Technology Project in Henan province in 2018 (182102310200)
China Postdoctoral Science Foundation in 2018 (2018M630839)
The National Natural Science Foundation of China (81773175)
Received: 6 February 2020
Accepted: 11 June 2020
First Online: 17 June 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board (IRB No.2018-LW-016). Written informed consent was obtained from participants included in the study. All participants were informed that any personal information obtained in this study would remain confidential.
: Not applicable.
: No conflict of interest has been declared by the authors.