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(a) Course of median total serum calcium and phosphate levels. Differently colored background areas indicate normal serum levels for either electrolyte. (b) Course of total serum calcium levels. Box-whisker-plot shows median and interquartile range with outliers (open circles); (c) Course of total serum phosphate levels. Box-whisker plot shows median and interquartile range with outliers (open circles). M, month; VD, vitamin D.
