Funding for this research was provided by:
National Basic Research Program of China (973 Program) (2016YFC0900803)
National Natural Science Foundation of China (81573243, 81602925, U1304821)
High-level Personnel Special Support Project of Zhengzhou University (ZDGD13001)
Henan Provincial Science Fund for Distinguished Young Scholars (164100510021)
Science and Technology Innovation Talents Support Plan of Henan Province Colleges and Universities (14HASTIT035)
Received: 9 April 2019
Accepted: 20 June 2019
First Online: 27 June 2019
Ethics approval and consent to participate
: This study was approved by the Zhengzhou University Life Science Ethics Committee (Code:  MEC (S128)). The present study was conducted according to the 1975 Declaration of Helsinki and informed consent was signed by all study participants.
: This manuscript does not contain data from any individual person. Consent for publication is “not applicable.”
: The authors declare that they have no competing interests.