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. 2018 Apr 10;67(9):1637–1645. doi: 10.1136/gutjnl-2017-315082

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OR for each sample site on contamination. AM20, microbial growth with ≥20 CFU/20 mL of any type of microorganism; CFU, colony forming units; MGO, presence of any microbial growth of gastrointestinal or oral microorganisms.