Received: 17 November 2020
Accepted: 7 April 2021
First Online: 29 April 2021
: All protocols were carried out in accordance with relevant guidelines and regulations. All procedures were reviewed and approved by Institutional Review Board of the Guangzhou Blood Center and Institutional Review Board of the Chengdu Blood Center (Approval Number: GZBC20191031, CDBC20191002). The written informed consent was obtained from the all participants for the study. When donors donated blood, they were informed and consented that the donation data may be used for scientific research purpose with personal information de-identified. The informed consents were part of the pre-donation health consultation form used in Guangzhou Blood Center and Chengdu Blood Center.
: Not applicable.
: The authors report no conflicts of interest.