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Cambell DI, Ognjanovic M, Smith H, Clarke J, Watson S, Court S. Ioning out the diagnosis in chronic diarrhoea. Arch Dis Child Educ Pract Ed 2005;90:ep68–73.

In the footnote to table 3, the formula for urinary fractional excretion of magnesium is incorrect. It should read: Urinary fractional excretion of magnesium  =  ([Ur Mg]/[Pl Mg]×[Pl Cr]/[Ur Cr]) ×100% and all units should be in mmol/l.

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