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In the article by Thomson and colleagues (1), the authors identified an error in the description of the calcium dose in the abstract and first paragraph and under Randomization and Interventions in the Methods section. In the abstract and Methods section, the text reads “1000 mg of calcium carbonate (400 mg of elemental calcium).” In the first paragraph, the text reads “(1000 mg of calcium [400 mg of elemental calcium]).” It should read “1000 mg of elemental calcium as calcium carbonate.” The text has been corrected in all places.