Evaluation of analytical performance routine chemistry projects in 26 result mutual recognition laboratories in Hebei province by σ metric method#br#
WU Hao， WANG Hui-ru*， LI Gui-xia， LIU Bin， WANG Sheng-hua， FENG Zhi-shan
Journal of Hebei Medical University . 2019, (10): 1207 -1210,1225 .  DOI: 10.3969/j.issn.1007-3205.2019.10.021