Database	Total records
The Cochrane Central Register of Controlled Trials (CENTRAL) 2016, Issue 3, part of The Cochrane Library.www.thecochranelibrary.com	51
The Cochrane Central Register of Controlled Trials (CENTRAL) 2017, Issue 3, part of The Cochrane Library.www.cochranelibrary.com	129
NHS Economic Evaluation Database (NHSEED) 2015, Issue 2, part of The Cochrane Library.www.cochranelibrary.com	42
MEDLINE In‐Process & Other Non‐Indexed Citations, MEDLINE Daily and MEDLINE 1946 to Present, Ovid	1,609
MEDLINE Epub Ahead of Print, In‐Process & Other Non‐Indexed Citations, MEDLINE Daily and MEDLINE 1946 to Present, Ovid	1,821
Embase 1974 to 2016 Week 15, Ovid	1,527
Embase 1974 to 2017 April 05, Ovid	707
EconLit 1969 – present, ProQuest	239
Global Health 1973 to 2016 Week 14, Ovid	640
LILACS, VHL	298
LILACS, VHL: http://lilacs.bvsalud.org/en/	342
Sub total	7,405
ClinicalTrials.gov	251
International Clinical Trials Registry Platform (ICTRP)	297
Eldis	1,292
Google Scholar	1,153
Grey Literature Report	437
OECD Library	37
Open Grey	258
World Bank	25
Sub total	3,750
TOTAL	11,155