#14	#11 AND #13
#13	'randomized controlled trial' OR 'randomized controlled trials' OR 'controlled clinical trial' OR 'controlled clinical trials' OR random*:ab,ti OR 'double blind procedure' OR 'double blind procedures' OR 'single blind procedure' OR 'single blind procedures' OR 'clinical trial' OR 'clinical trials' OR 'controlled study' OR 'controlled studies' OR 'clinical study'/de OR 'major clinical study'/exp
#12	#10 AND [animals]/lim NOT [humans]/lim
#11	#10 NOT ([animals]/lim NOT [humans]/lim)
#10	#9 NOT ('editorial'/de OR 'letter'/de OR 'case report'/de)
#9	#3 OR #6 OR #7 OR #8
#8	anesthe*:ti OR anaesthe*:ti OR analges*:ti AND metasta*:ti
#7	anesthe*:ti OR anaesthe*:ti OR analges*:ti AND (neoplasm*:ti OR tumor*:ti OR tumour*:ti OR cancer*:ti) AND (recur*:ti OR risk*:ti OR metasta*:ti)
#6	#4 AND #5
#5	'cancer recurrence'/exp OR 'recurrent cancer'/exp OR 'tumor recurrence'/exp OR 'metastasis'/de OR 'cocarcinogenesis'/de OR 'cancer invasion'/exp
#4	'anesthesiological techniques'/exp/mj OR 'anesthetic agent'/exp/mj OR 'analgesic agent'/exp/mj OR 'local anesthetic agent'/exp/mj OR 'anesthesia complication'/exp/mj
#3	#1 AND #2
#2	'cancer recurrence'/exp/mj OR 'recurrent cancer'/exp/mj OR 'tumor recurrence'/exp/mj OR 'metastasis'/mj OR 'cocarcinogenesis'/mj OR 'cancer invasion'/exp/mj
#1	'anesthesiological techniques'/exp OR 'anesthetic agent'/exp OR 'analgesic agent'/exp OR 'local anesthetic agent'/exp OR 'anesthesia complication'/exp