Database/ Resource	Strategy
PubMed	(cystic fibrosis OR mucoviscidosis) AND (probiotic* OR prebiotic* OR symbiotic* OR Lactobacillus OR Bifidobacterium OR Streptococcus OR Saccharyomyces) AND (randomized controlled trial [pt] OR controlled clinical trial [pt] OR randomized [tiab] OR placebo [tiab] OR drug therapy [sh] OR randomly [tiab] OR trial [tiab] OR groups [tiab] NOT (animals [mh] NOT humans [mh]))
ClinicalTrials.gov	Condition/ Disease: Cystic fibrosis Other terms: probiotic OR prebiotic OR synbiotic OR Lactobacillus OR Bifidobacterium OR Streptococcus OR Saccharomyces
WHO International Clinical Trials Registry Platform (ICTRP)	[Advanced Search Form] Condition: cystic fibrosis Intervention: probiotic OR prebiotic OR synbiotic OR Lactobacillus OR Bifidobacterium OR Streptococcus OR Saccharomyces Recruitment Status: All
Open Grey	cystic fibrosis AND (probiotic* OR prebiotic* OR symbiotic* OR Lactobacillus OR Bifidobacterium OR Streptococcus OR Saccharomyces)