AMP	antimicrobial peptide
CD	Crohn’s disease
CGRP	calcitonin gene-related peptide
CI	confidence interval
HR	hazard ratio
IBD	inflammatory bowel disease
IL	interleukin
IRR	incidence rate ratio
MMP	matrix metalloproteinase
OR	odds ratio
PKKS	plasma kallikrein–kinin system
RR	relative risk
SIBO	small intestinal bacterial overgrowth
Th	T helper
TRPV	transient receptor potential vanilloid type
UC	ulcerative colitis