Decrease in the internal quality control intermediate reproducibility imprecision of Cystatin C results in China in the years from 2014 to 2023​Zhixin Zhang, Jie Zeng, Wei Wang, Yuxuan Du, Shuai Yuan, Na Dong, Chuanbao Zhang, Zhiguo WangNational Center for Clinical Laboratories/Beijing Engineering Research Center of Laboratory Medicine, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology, Beijing, Chinaon March 14, 2025 at 4:39 am