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The study by Bailey et al.
http://www.ncbi.nlm.nih.gov/pubmed/22338984 "Vitamin D Testing Patterns
Among Six Veterans Medical Centers in the Southeastern United States:
Links With Medical Costs" indicated that increased rates of vitamin D
testing led to treatment of deficiency and/or insufficieny and that this
in turn was correlated with a reduction in net costs (and improvement with
health) due to fewer illnesses.