TY - GEN AU - Mary Bedner AU - Katrice Lippa AU - Susan Tai C2 - NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD DA - 2013-03-18 DO - https://doi.org/10.6028/NIST.IR.7894 LA - en PB - NIST Interagency/Internal Report (NISTIR), 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 -