Database	Search date	Date range	Number of records
CENTRAL (part of the Cochrane Library), which includes the Cochrane Developmental, Psychosocial and Learning Problems Group Specialised Register	8 June 2014	Issue 6 of 12 June 2014	240
	24 July 2014	Issue 6 of 12 June 2014	1178
	29 July 2015	Issue 6 of 12 June 2015	143
Ovid MEDLINE	8 June 2014	1946 to Week 1 2014	595
	23 July 2014	1946 to July Week 2 2014	2668
	29 July 2015	1946 to July Week 3 2015	246
Embase (OVID)	8 June 2014	1974 to Week 1 2014	735
	23 July 2014	1980 to Week 29 2014	2214
	29 July 2015	1946 to July Week 3 2015	281
CINAHL Plus (EBSCOhost)	8 June 2014	1938 to current	1352
	24 July 2014	1938 to current	1778
	30 July 2015	1938 to current	156
PsycINFO (OVID)	8 June 2014	1806 to Week 1 2014	558
	24 July 2014	1967 to July Week 3 2014	2354
	30 July 2015	1967 to July Week 3 2015	305
ERIC (Proquest)	8 June 2014	1966 to current	180
	24 July 2014	1966 to current	636
ERIC (EBSCOhost)	30 July 2015	1966‐current	58
Sociological Abstracts and ASSIA (Proquest)	8 June 2014	1952 to current	87
Sociological Abstracts ( Proquest)	24 July 2014	1952 to current	588
	30 July 2015	1952 to current	58
Social Sciences Citation Index/Conference Paper Citation Index ‐ Social Science & Humanities (Web of Science)	24 July 2014	1970 to current / 1990 to current	929
	30 July 2015	1970 to 29 July 2015 / 1990 to 29 July 2015	172
Cochrane Database of Systematic Reviews (CDSR, part of the Cochrane Library)	24 July 2014	Issue 7 of 12 July 2014	16
	29 July 2015	Issue 7 of 12 July 2015	1
Database of Abstracts of Reviews of Effects (DARE, part of The Cochrane Libaray)	24 July 2014	Issue 2 of 4 April 2014	19
	29 July 2015	Issue 2 of 4 April 2015	4
BIOSIS Citation Index (Web of Knowledge)	8 June 2014	1926 to current	253
BIOSIS Previews (Web of Knowledge)	2 October 2015	1926 to current	58
Dissertation Abstracts (Proquest)	8 June 2014	all available years	2
Dissertations & Theses (Proquest)	2 October 2015	all available years	26
WHO ICTRP	25 July 2014	all available years	123
	31 July 2015	all available years de‐duplicated against previous records	27
ClinicalTrials.gov	8 June 2014	all available years	38
	25 July 2014	all available years	278
	31 July 2015	Trials added 1 July 2014 to 31 July 2015	74
		Total	18,430
		Total after removal of duplicates	12,051