TY - GEN AU - Bedner, Mary AU - Lippa, Katrice A. AU - Tai, Susan S. C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2015-02-01 05:02:00 DO - https://doi.org/10.6028/NIST.IR.8000 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2015 TI - NIST/NIH Vitamin D Metabolites Quality Assurance Program Report of Participant Results: Summer 2013 Comparability Study(Exercise 7): ER -