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(A) Number of items for different scales of IBS-D symptoms; (B) Number of items for different scales of QOL; (C) Number of items for different mechanism research. BSFS, Bristol Stool Form Scale; FDDQL, functional digestive diseases quality of life; IBS-QOL, IBS quality of life; IBS-SSS, IBS severity scoring system; SF-36, 36-Item Short Form Survey; VAS, visual analog scale.
