@misc{1136416, author = {Mary Bedner and Katrice A. Lippa and Susan S. Tai}, title = {NIST/NIH Vitamin D Metabolites Quality Assurance Program Report of Participant Results: Summer 2013 Comparability Study(Exercise 7):}, year = {2015}, month = {2015-02-01 05:02:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NIST.IR.8000}, language = {en}, }