CI	Confidence intervals
ENS	Enteric nervous system
FMT	Fecal microbiota transplantation
IBS	Irritable bowel syndrome
IBS-D	Diarrhea-predominant irritable bowel syndrome
IBS-QoL	IBS quality of life
IBS-SSS	IBS symptom severity scale
OR	Odds ratio
RCT	Randomized controlled trial
RR	Relative risk
SD	Standard deviation
SMD	Standardized mean difference