Heaney, Robert P The case for improving vitamin D status. [electronic resource] - The Journal of steroid biochemistry and molecular biology Mar 2007 - 635-41 p. digital Publication Type: Journal Article ISSN: 0960-0760 Standard No.: 10.1016/j.jsbmb.2006.12.006 doi Subjects--Topical Terms: DietDiseaseHumansVitamin D--metabolism