Table 1.

Searched databases and search string.

Database	Search String
Embase	((‘adult’/exp OR ‘adult’ OR ‘adults’ OR ‘grown-ups’ OR ‘grownup’ OR ‘grownups’) AND (‘nonalcoholic fatty liver’/exp OR ‘nafld (nonalcoholic fatty liver disease)’ OR ‘non-alcoholic fatty liver disease’ OR ‘non-alcoholic hepato-steatosis’ OR ‘non-alcoholic hepatosteatosis’ OR ‘non-alcoholic liver steatosis’ OR ‘non-alcoholic steatotic hepatopathy’ OR ‘non-alcoholic fld’ OR ‘non-alcoholic fatty liver’ OR ‘non-alcoholic fatty liver disease’ OR ‘non-alcoholic hepatic steatosis’ OR ‘nonalcoholic fld’ OR ‘nonalcoholic fatty liver’ OR ‘nonalcoholic fatty liver disease’ OR ‘nonalcoholic hepatic steatosis’ OR ‘nonalcoholic hepatosteatosis’ OR ‘nonalcoholic liver steatosis’) OR ‘nonalcoholic steatohepatitis’/exp OR ‘nash (nonalcoholic steatohepatitis)’ OR ‘non-alcohol steato-hepatitis’ OR ‘non-alcohol steatohepatitis’ OR ‘non-alcoholic steato-hepatitis’ OR ‘non-alcohol steato-hepatitis’ OR ‘non-alcohol steatohepatitis’ OR ‘non-alcoholic steatohepatitis’ OR ‘non-alcoholic steatosis hepatitis’ OR ‘non-alcoholic steatotic hepatitis’ OR ‘nonalcohol steato-hepatitis’ OR ‘nonalcohol steatohepatitis’ OR ‘nonalcoholic fatty liver inflammation’ OR ‘nonalcoholic steato-hepatitis’ OR ‘nonalcoholic steatohepatitis’ OR ‘nonalcoholic steatosis hepatitis’ OR ‘nonalcoholic steatotic hepatitis’ OR ‘liver fibrosis’/exp OR ‘fibrosis, liver’ OR ‘fibrous hepatic disease’ OR ‘hepatic fibrosis’ OR ‘liver fibrosis’ OR ‘liver periportal fibrosis’ OR ‘periportal fibrosis’ OR ‘liver cirrhosis’/exp OR ‘cirrhosis’ OR ‘cirrhosis hepatis’ OR ‘cirrhosis, liver’ OR ‘cryptogenic liver cirrhosis’ OR ‘dietary cirrhosis’ OR ‘dietary liver cirrhosis’ OR ‘hepatic cirrhosis’ OR ‘liver cirrhosis’ OR ‘postnecrotic liver cirrhosis’) AND (‘small intestinal bacterial overgrowth’/exp OR ‘sbbo (small bowel bacterial overgrowth)’ OR ‘sibo’ OR ‘sibo syndrome’ OR ‘bacterial overgrowth syndrome (small intestine)’ OR ‘contaminated small bowel syndrome’ OR ‘enteral bacterial overgrowth’ OR ‘enteric bacteria overgrowth’ OR ‘enteric bacterial overgrowth’ OR ‘small bowel bacteria overgrowth’ OR ‘small bowel bacterial over growth’ OR ‘small bowel bacterial overgrowth’ OR ‘small bowel bacterial overgrowth syndrome’ OR ‘small bowel intestinal overgrowth’ OR ‘small gut bacterial overgrowth’ OR ‘small intestinal bacteria overgrowth’ OR ‘small intestinal bacterial over-growth’ OR ‘small intestinal bacterial overgrowth’ OR ‘small intestinal bacterial overgrowth syndrome’ OR ‘small intestinal bowel overgrowth’ OR ‘small intestinal overgrowth’ OR ‘small intestine bacteria overgrowth’ OR ‘small intestine bacterial over-growth’ OR ‘small intestine bacterial overgrowth’ OR ‘small intestine bacterium overgrowth’ OR ‘small intestine overgrowth’ OR ‘upper gut bacterial overgrowth’)
PubMed/Cinahl/Web of Science	(SIBO OR small intestinal bacterial overgrowth OR breath test* OR intestinal microbiology) AND (NAFLD OR “non-alcoholic fatty liver” OR NASH OR liver fibrosis OR cirrhosis OR steatohepatitis)
ClinTrials.Gov	NAFLD OR NASH OR hepatic fibrosis OR cirrhosis