Database	Time span	Search strategy
Cochrane Hepato‐Biliary Group Controlled Trials Register	January 2014.	(dopa* OR 'dopa decarboxylase' OR levodopa OR bromocriptine) AND ('liver cirrhosis' OR 'hepatic encephalopathy')
The Cochrane Central Register of Controlled Trials (CENTRAL)	Issue 12 of 12, 2013.	#1 MeSH descriptor: [Dopamine Agents] explode all trees #2 MeSH descriptor: [Dopa Decarboxylase] explode all trees #3 MeSH descriptor: [Levodopa] explode all trees #4 MeSH descriptor: [Bromocriptine] explode all trees #5 dopa* or dopa decarboxylase or levodopa or bromocriptine #6  #1 or #2 or #3 or #4 or #5 #7 MeSH descriptor: [Liver Cirrhosis] explode all trees #8 MeSH descriptor: [Hepatic Encephalopathy] explode all trees #9 (liver cirrhosis or hepatic encephalopathy) #10 #7 or #8 or #9 #11 #6 and #10
MEDLINE (Ovid SP)	1946 to January 2014.	1. exp Dopamine Agents/ 2. exp Dopa Decarboxylase/ 3. exp Levodopa/ 4. exp Bromocriptine/ 5. (dopa* or dopa decarboxylase or levodopa or bromocriptine).mp. [mp=protocol supplementary concept, rare disease supplementary concept, title, original title, abstract, name of substance word, subject heading word, unique identifier] 6. 1 or 2 or 3 or 4 or 5 7. exp Liver Cirrhosis/ 8. exp Hepatic Encephalopathy/ 9. (liver cirrhosis or hepatic encephalopathy).mp. [mp=protocol supplementary concept, rare disease supplementary concept, title, original title, abstract, name of substance word, subject heading word, unique identifier] 10. 7 or 8 or 9 11. 6 and 10 12. (random* or blind* or placebo* or meta‐analysis).mp. [mp=protocol supplementary concept, rare disease supplementary concept, title, original title, abstract, name of substance word, subject heading word, unique identifier] 13. 11 and 12
EMBASE (Ovid SP)	1974 to January 2014.	1. exp dopamine receptor stimulating agent/ 2. exp dopamine receptor blocking agent/ 3. exp aromatic levo amino acid decarboxylase/ 4. exp LEVODOPA/ 5. exp BROMOCRIPTINE/ 6. (dopa* or dopa decarboxylase or levodopa or bromocriptine).mp. [mp=title, abstract, subject headings, heading word, drug trade name, original title, device manufacturer, drug manufacturer] 7. 1 or 2 or 3 or 4 or 5 or 6 8. exp liver cirrhosis/ 9. exp hepatic encephalopathy/ 10. (liver cirrhosis or hepatic encephalopathy).mp. [mp=title, abstract, subject headings, heading word, drug trade name, original title, device manufacturer, drug manufacturer] 11. 8 or 9 or 10 12. 7 and 11 13. (random* or blind* or placebo* or meta‐analysis).mp. [mp=title, abstract, subject headings, heading word, drug trade name, original title, device manufacturer, drug manufacturer] 14. 12 and 13
Science Citation Index‐Expanded (http://apps.webofknowledge.com)	1900 to January 2014.	#5 20 #4 AND #3 #4 1,186,796 TS=(random* or blind* or placebo* or meta‐analysis) #3 205 #2 AND #1 #2 54,464 TS=(liver cirrhosis or hepatic encephalopathy) #1 198,470 TS=(dopa* or dopa decarboxylase or levodopa or bromocriptine)