Gastroenterology Research , a peer-reviewed journal, formally retracted the paper on June 11, stating in a short notice that concerns have been raised regarding the articles methodology, source data processing including statistical analysis, and reliability of conclusions. The retraction, which does not specify the nature of those concerns, came nearly a year after studys publication, in June 2022
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Consequently, they were assigned into three subgroups ( n = 6) according to the type of exposure agent: Subgroups I (NSI and CDI) were exposed to electronic cigarettes (e-cigarettes, Juul), subgroups II (NSII and CDII) were exposed to conventional cigarettes (c-cigarettes, Marlboro Red), and subgroups III (NSIII and CDIII), which served as the control group, had no exposure that incubated with artificial saliva for the exposure period