Database	Search date	Date range/issue	Number of records
Cochrane Central Register of Controlled Trials (CENTRAL) in the Cochrane Library	23 October 2015	Issue 9 of 12, September 2015	75
	18 January 2017	Issue 11 of 12, November 2016	15
MEDLINE Ovid	22 October 2015	1946 to October Week 3 2015	559
	17 January 2017	1946 to December Week 1 2016	74
MEDLINE Ovid Epub Ahead of Print	17 January 2017	16 January 2017	15
MEDLINE Ovid In‐Process & Other Non‐Indexed Citations	17 January 2017	16 January 2017	39
Embase OVID	22 October 2015	1974 to 2015 Week 42	695
	17 January 2017	1974 to 2017 Week 3	94
CINAHL Plus EBSCOhost (Cumulative Index to Nursing and Allied Health Literature)	23 October 2015	1937 to current	402
	17 January 2017	1937 to current	22
Cochrane Database of Systematic Reviews (CDSR) part of the Cochrane Library	23 October 2015	Issue 10 of 12, October 2015	15
	18 January 2017	Issue 1 of 12, January 2015	6
Database of Abstracts of Reviews of Effects (DARE) part of the Cochrane Library	23 October 2015	Issue 2 of 4, April 2015	4
ERIC EBSCOhost (Education Resources Information Center)	23 October 2015	1966 to current	564
	17 January 2017	1966 to current	32
PsycINFO OVID	22 October 2015	1967 to October Week 3 2015	1417
	17 January 2017	1967 to January Week 2 2017	118
Sociological Abstracts ProQuest	23 October 2015	1952 to current	52
	18 January 2017	1952 to current	4
Dissertation Abstracts International ProQuest	4 November 2015	1743 to current	176
	16 January 2017	1743 to current	215
AutismData (autism.org.uk/autismdata)	23 October 2015	All years	6
	18 January 2017	All years	4
UK Clinical Research Network Study Portfolio (UKCRN; public.ukcrn.org.uk/search); replaced by UK Clinical Trials Gateway	23 October 2015	All years	1
UK Clinical Trials Gateway (UKCTG; ukctg.nihr.ac.uk); replaces UK Clinical Research Network Study Portfolio	18 January 2017	All years	1
ClinicalTrials.gov (clinicaltrials.gov/ct2/home)	23 October 2015	All years	82
	18 January 2017	All years	24
World Health Organisation International Clinical Trials Registry Platform (WHO ICTRP; apps.who.int/trialsearch/AdvSearch.aspx)	23 October 2015	All years	91
	18 January 2017	All years	3
Total records			4805