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was supported by a Wellcome Trust Clinical Research Training Fellowship
To assess differential item functioning (DIF), we used the lordif package in the R platform, which uses an ordinal logistic regression framework and graded response model for IRT trait estimation
It functions in cellular signaling and lipid metabolism and has a role in serotonin signaling, which is the basis for the frequent claim that it curbs appetite
Gastroenterology 2007;132:21312157.ArticlePubMed 91
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