On the Epidemiology of Influenza. — Full Text Virol J. 2008 Feb 25;5:29. Review. This is an excellent article that explains how vitamin D levels can explain why we have influenza problems in the winter months.
Use of Vitamin D in Clinical Practice. — Full Text (PDF download) Altern Med Rev. 2008 Mar;13(1):6–20. Review. This is a very good article for health practitioners to understand the clinical use of vitamin D. It is also helpful for the public overall, to understand the varied uses of vitamin D as a way to prevent and treat people of various illnesses.