Funding for this research was provided by:
Ningxia Science and Technology Department (2019BBF02005)
Received: 20 October 2019
Accepted: 2 June 2020
First Online: 10 June 2020
Ethics approval and consent to participate
: This study was submitted to and approved by the Laboratory Animal Ethical and Welfare Committee of Ningxia University (Approval No. NXU-ACAU-2019-008). All owners of farmers who participated in this study provided their verbal consent for use of skin desquamation and hair samples based on the long and tight cooperative fellowship between the owners and our department, which was approved by Laboratory Animal Ethical and Welfare Committee of Ningxia University.
: Not applicable.
: All authors declare that they have no conflict of interests.