Database	Time span	Search strategy
The Cochrane Hepato‐Biliary Group Controlled Trials Register	Date of search	(diet* AND fat* AND (restrict* OR modif*)) AND (cholelithiasis OR gallstone* OR 'gall stone*' OR gall‐stone*)
Cochrane Central Register of Controlled Trials (CENTRAL) in the Cochrane Library	Latest issue	#1 MeSH descriptor Nutrition Therapy explode all trees #2 MeSH descriptor Dietary Fats explode all trees #3 MeSH descriptor Diet, Fat‐Restricted explode all trees #4 diet* AND fat* AND (restrict* OR modif*) #5 (#1 OR #2 OR #3 OR #4) #6 MeSH descriptor Cholelithiasis explode all trees #7 cholelithiasis OR gallstone* OR gall stone* OR gall‐stone* #8 (#6 OR #7) #9 (#5 AND #8)
MEDLINE Ovid	1946 to the date of search	1. exp Nutrition Therapy/ 2. exp Dietary Fats/ 3. exp Diet, Fat‐Restricted/ 4. (diet* and fat* and (restrict* or modif*)).mp. [mp=title, abstract, original title, name of substance word, subject heading word, protocol supplementary concept, rare disease supplementary concept, unique identifier] 5. 1 or 2 or 3 or 4 6. exp Cholelithiasis/ 7. (cholelithiasis or gallstone* or gall stone* or gall‐stone*).mp. [mp=title, abstract, original title, name of substance word, subject heading word, protocol supplementary concept, rare disease supplementary concept, unique identifier] 8. 6 or 7 9. 5 and 8 10. (random* or blind* or placebo* or meta‐analys*).mp. [mp=title, abstract, original title, name of substance word, subject heading word, protocol supplementary concept, rare disease supplementary concept, unique identifier] 11. 9 and 10
Embase Ovid	1974 to the date of search	1. exp diet therapy/ 2. exp fat intake/ 3. (diet* and fat* and (restrict* or modif*)).mp. [mp=title, abstract, subject headings, heading word, drug trade name, original title, device manufacturer, drug manufacturer, device trade name, keyword] 4. 1 or 2 or 3 5. exp cholelithiasis/ 6. (cholelithiasis or gallstone* or gall stone* or gall‐stone*).mp. [mp=title, abstract, subject headings, heading word, drug trade name, original title, device manufacturer, drug manufacturer, device trade name, keyword] 7. 5 or 6 8. 4 and 7 9. (random* or blind* or placebo* or meta‐analys*).mp. [mp=title, abstract, subject headings, heading word, drug trade name, original title, device manufacturer, drug manufacturer, device trade name, keyword] 10. 8 and 9
Science Citation Index Expanded (Web of Science)	1900 to the date of search	# 5 #4 AND #3 # 4 TS=(random* or blind* or placebo* or meta‐analys*) # 3 #2 AND #1 # 2 TS=(cholelithiasis or gallstone* or gall stone* or gall‐stone*) # 1 TS=(diet* and fat* and (restrict* or modif*))