Database	Search terms	Date searched
PubMed (www.ncbi.nlm.nih.gov/pubmed)	#1 randomized controlled trial [pt] #2 controlled clinical trial [pt] #3 randomized [tiab] #4 placebo [tiab] #5 drug therapy [sh] #6 randomly [tiab] #7 trial [tiab] #8 groups [tiab] #9 #1 OR #2 OR #3 OR #4 OR #5 OR #6 OR #7 OR #8 #10 animals [mh] NOT humans [mh] #11 #9 NOT #10 #12 cystic fibrosis [MeSH Terms] OR "cystic fibrosis" [af] OR mucoviscidosis [af] OR mucoviscidose [af] #13 diabetes OR diabetic [af] #14 #11 AND #12 AND #13 *NOTE: Lines #1‐ #11 are the Cochrane Highly Sensitive Search Strategy for identifying randomized trials in MEDLINE: sensitivity‐maximizing version (2008 revision); PubMed format	21 March 2020
ClinicalTrials.gov (ClinicalTrials.gov)	[Advanced Search] CONDITION/ DISEASE: cystic fibrosis OTHER TERMS: diabetes STUDY TYPE: Interventional Studies	21 March 2020
WHO ICTRP (apps.who.int/trialsearch)	[Basic Search] cystic fibrosis AND diabetes [WHO ICTRP REGISTER NOT WORKING AT THE MOMENT. SEARCH TERMS NEED TO BE TESTED ONCE THE REGISTER IS UP AND RUNNING]	Search attempted 17 May 2020, database unavailable due to Covid