TABLE 5.

Keyword cluster analysis.

Cluster	Size	Sihouette	Mean year	Label (LLR)	Other keywords
#0	81	0.645	2014	probiotics	visceral hypersensitivity;placebo controlled trial; diet; small intestinal bacterial overgrowth
#1	76	0.578	2015	visceral pain	dorsal root ganglion; anterior cingulate cortex; histone acetylation; neonatal maternal deprivation
#2	70	0.496	2015	mast cell	visceral hypersensitivity; mast cells; enterochromaffin cell; glucagon-like peptide-1
#3	69	0.574	2015	abdominal pain	colonic distension; visceral sensation; hpa axis; spinal cord
#4	61	0.663	2015	prevalence	symptom; IBS; depression; risk factor
#5	23	0.889	2016	functional dyspepsia	gastric accommodation; overlap; postprandial distress syndrome; gastroesophageal reflux disease
#6	21	0.761	2017	serotonin	ankyrin 1; pi-ibs; pellino-1; inflammatory mediators
#7	20	0.844	2013	gastrointestinal tract	sensory neuron; transient receptor potential vanilloid 1; guanylate cyclase c; calcium channel