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Michałek D, Kołodziej M, Konarska Z, et al. Efficacy and safety of gelatine tannate for the treatment of acute gastroenteritis in children: protocol of a randomised controlled trial. BMJ Open 2016;6:e010530. doi: 10.1136/bmjopen-2015-010530
In the Abstract, the number of children to be recruited should be 72 (as shown under Power calculation).