TY - GEN AU - Katrice A. Lippa AU - Mary Bedner AU - Susan S.-C. Tai C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2012-12-01 05:12:00 DO - https://doi.org/10.6028/NIST.IR.7891 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: Summer 2010 Comparability Study (Exercise 2): ER -