TY - GEN AU - Mary Bedner AU - Katrice A. Lippa C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2012-12-01 05:12:00 DO - https://doi.org/10.6028/NIST.IR.7890 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2012 TI - NIST/NIH Vitamin D Metabolites Quality Assurance Program Report of Participant Results: Winter 2010 Comparability Study (Exercise 1): ER -