Affiliation: | (1) European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Retieseweg 111, 2440 Geel, Belgium;(2) Quality Analysis Consultants, Winnipeg, MB, Canada;(3) Merieux NutriSciences Corporation, Chicago, IL, USA;(4) Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD, USA;(5) AIM Research Enterprises LLC, Carthage, MO, USA |