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. 2009 Jan 19;9:22. doi: 10.1186/1471-2458-9-22

Figure 2.

Figure 2

25(OH)D plotted against serum PTH concentration: a) winter, age under 50 years; b) summer, age under 50 years, c) winter, age 50 and above; d) summer, age 50 and above.