NISTIR 7892: NIST/NIH Vitamin D Metabolites Quality Assurance Program Report of Participant Results: Winter 2011 Comparability Study (Exercise 3) NISTIR 7891: NIST/NIH Vitamin D Metabolites Quality Assurance Program Report of Participant Results: Summer 2010 Comparability Study (Exercise 2) NISTIR 7890: NIST/NIH Vitamin D Metabolites Quality Assurance Program Report of Participant Results: Winter 2010 Comparability Study (Exercise 1) Reports for the twelve exercises have been published:
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