I dunno, but the following has been influential:
Vitamin D Deficiency — Is There Really a Pandemic?
JoAnn E. Manson, M.D., Dr.P.H., Patsy M. Brannon, Ph.D., R.D., Clifford J. Rosen, M.D., and Christine L. T…
November 10, 2016
N Engl J Med 2016; 375:1817-1820
Abstract / Article Extract
The claim that large proportions of North American and other populations are deficient in vitamin D is based on misinterpretation and misapplication of the Institute of Medicine reference values for nutrients — misunderstandings that can adversely affect patient care.