TY - RPRT TI - NIST micronutrients measurement quality assurance program winter 2002 comparability studies : results for round robin LI fat-soluble vitamins and carotenoids in human serum and round robin 16 ascorbic acid in human serum AU - Duewer, David L. AU - Margolis, Sam A. AU - Sharpless, Katherine E. AU - Thomas, Jeanice B. PY - 2013 PB - National Institute of Standards and Technology SN - NIST IR 7880-21 DO - 10.6028/NIST.IR.7880-21 ER -