Optimization of vitamin suppletion after Roux-en-Y gastric bypass surgery can lower postoperative deficiencies: a randomized controlled trial.

Medicine (Baltimore) · 2014 · PMC4616370 · PMID 25437032

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did not reach statistical significanceno p-value reported

The fact that the difference in ferritin levels at 12 months did not reach statistical significance is attributed to a lack of power in this study.

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