Atisook, K., Suntudrob, J., & Jongmevasana, W. (2015). Development of Proficiency Testing Quality System on Food and Water Analysis (2011-2013). BULLETIN OF THE DEPARTMENT OF MEDICAL SCIENCES, 57(2), 79–90. retrieved from https://he02.tci-thaijo.org/index.php/dmsc/article/view/242580