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The Effect of Metformin on Adolescents with Type 1 Diabetes: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.

Int J Endocrinol · 2016 · PMC4960345 · PMID 27478438

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Although the four relatively small trials did not reach statistical significance for any adverse events, the largest trial, by Libman et al., did find that the rate of metformin-associated gastrointestinal events was increased [ 15 ].

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.