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Irritable bowel syndrome Irritable bowel syndrome lesson Irritable bowel syndrome symptoms Irritable bowel syndrome pathogenesis IBS symptoms IBS lesson IBS pathogenesis IBS Diagnosis IBS treatment Bristol stool chart Irritable bowel syndrome diagnosis Irritable bowel syndrome treatment Irritable bowel syndrome probiotics Irritable bowel syndrome antibiotics IBS probiotics IBS antibiotics IBS stress IBS USMLE Post-infectious IBS fiber for ibs