Figure 1.

Number of basic and clinical research papers published (Y-axis) as screened using Web of Science [v.5.28.1] under the search terms “magnesium deficiency” (yellow), “calcium deficiency” (green) or “iron deficiency” (blue) (performed 4 May 2018) over the past 25 years (X-axis; 2017–1992). (Inset) Trend lines show the relatively flat research output on magnesium deficiency relative to calcium and iron.