Yan, He
Li, Mei
Xia, Zhi-gui
Yin, Jian-hai
Funding for this research was provided by:
National Science and Technology Major Program of China (No. 2018ZX10101002-002-005)
Bill & Melinda Gates Foundation (No. INV-018913)
Article History
Received: 22 May 2023
Accepted: 16 February 2024
First Online: 26 February 2024
Declarations
:
: Dried blood spots were prepared from residual blood samples referred from patients attending hospitals across the country, ethical approval to use such samples for EQA purposes is not required.
: The authors declare no competing interests.