MEDLINE	EMBASE	PsycINFO
13. randomized controlled trials as topic/	14. randomized controlled trial/	13. treatment effectiveness evaluation/
14. randomized controlled trial.pt.	15. phase 3 clinical trial/  or phase 4 clinical trial/	14. clinical trials/
15. controlled clinical trial.pt.	16. double blind procedure/	15. placebo/
16. randomi#ed.ab.	17. single blind procedure/	16. mental health program evaluation/
17. placebo$.ab.	18. triple blind procedure/	17. mental health program evaluation/
18. randomly.ab.	19. randomization/	18. placebo$.tw.
19. trial.ti.	20. controlled study/	19. random$.tw.
20. or/13‐19	21. placebo/	20. randomi#ed controlled trial$.tw.
21. (animals not (humans and animals)).sh.	22. placebo$.tw.	21. (clinical adj3 trial$).tw.
22. 20 not 21	23. random$.tw.	22. (research adj3 design).tw.
	24. randomi#ed controlled trial$.tw.	23. (evaluat$ adj3 stud$).tw.
	25. (clinical adj3 trial$).tw.	24. (prospectiv$ adj3 stud$).tw.
	26. ((singl$ or doubl$ or trebl$ or tripl$) adj3 (blind$ or mask$)).tw.	25. ((singl$ or doubl$ or trebl$ or tripl$) adj3 (blind$ or mask$ or dummy)).tw.
	27. or/13‐25	26. or/13‐25
	28. ((animal or nonhuman) not (human and (animal or nonhuman))).de.	27. (animal not ((human or inpatient or outpatient) and animal)).po.
	29. 27 not 28	28. 26 not 27