TY - GEN AU - Bedner, Mary AU - Lippa, Katrice A. AU - Tai, Susan S.-C. C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2013-03-01 05:03:00 DO - https://doi.org/10.6028/NIST.IR.7894 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2013 TI - NIST/NIH Vitamin D Metabolites Quality Assurance Program Report of Participant Results: Winter 2012 Comparability Study(Exercise 5): ER -