# 11	#10 AND Document Type=(Article OR Meeting OR Meeting Paper) AND Taxa Notes=(Humans) Databases=PREVIEWS Timespan=All Years
# 10	#9 AND Document Type=(Article OR Meeting OR Meeting Paper) Databases=PREVIEWS Timespan=All Years
# 9	#8 AND #7 Databases=PREVIEWS Timespan=All Years
# 8	Topic=(random* OR "controlled clinical trial" OR "controlled clinical trials" OR "double blind method" OR "double blind methods" OR "single blind method" OR "single blind methods" OR "clinical trial" OR "clinical trials" OR "research design" OR "controlled study" OR "controlled studies" OR "clinical study" OR "clinical studies") Databases=PREVIEWS Timespan=All Years
# 7	#6 OR #5 Databases=PREVIEWS Timespan=All Years
# 6	Title=(anesthe* or anaesthe* or analges*) AND Title=(metasta*) Databases=PREVIEWS Timespan=All Years
# 5	#3 and #4 Databases=PREVIEWS Timespan=All Years
# 4	Topic=(neoplasm* or tumor* or tumour* or cancer*) AND Topic=(recur* or risk* or metasta*) Databases=PREVIEWS Timespan=All Years
# 3	#1 OR #2 Databases=PREVIEWS Timespan=All Years
# 2	Title=("magnesium sulfate" OR mepivacaine OR methohexital OR methoxyflurane OR methyleugenol OR midazolam OR minaxolone OR "nitrous oxide" OR norflurane OR pentacaine OR phenoxyethanol OR pregnanolone OR prilocaine OR procaine OR propanidid OR propisomide OR propofol OR propoxycaine OR proxymetacaine OR remifentanil OR romifidine OR ropivacaine OR sevoflurane OR "sodium oxybate" OR sufentanil OR "tec solution" OR tetracaine OR tetrahydrodeoxycorticosterone OR tetrodotoxin OR thiamylal OR thiopental OR tiletamine OR tribromoethanol OR tricaine OR trichloroethylene OR trimecaine OR urethane) Databases=PREVIEWS Timespan=All Years
# 1	Title=(anesthe* OR anaesthe* OR analges* OR opioid* OR opiate* OR morphine* OR alfentanil OR alphadolone OR alphaxalone OR benoxinate OR benzocaine OR "benzyl alcohol" OR bumecain OR bupivacaine OR butamben OR carbizocaine OR carticaine OR chloralose OR chloroprocaine OR cyclopropane OR desflurane OR diazepam OR dibucaine OR diphenhydramine OR dyclonine OR emla OR enflurane OR entonox OR etidocaine OR etomidate OR ether OR fentanyl OR halothane OR heptacaine OR innovar OR isoflurane OR ketamine OR levobupivacaine OR lidocaine OR lignocaine) Databases=PREVIEWS Timespan=All Years