Analysis on the external quality assessment results for 25-hydroxyvitamin D of Shanghai from 2015 to 2019
FANG Huiling, GE Danhong, ZHU Yuqing, ZHU Lingfeng, ZHAO Xiaojun, CHEN Ziqi, WANG Zimeng
Laboratory Medicine . 2021, (2): 219 -224 .  DOI: 10.3969/j.issn.1673-8640.2021.02.021