Funding for this research was provided by:
National Science and Technology Major Project (2018ZX10306412-004)
Received: 2 September 2020
Accepted: 18 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: This study was approved by the institutional review boards in every participating blood establishments. Written informed consent and donor questionnaires were routinely completed at the time of donation from blood donors.
: Not applicable.
: The authors declare that they have no competing interests.