Table 2 Summary of academic database searches

Database	Search string	Keyword/topic	Hits	Results after duplication removed	Unique definitions included
Medline	‘Health information exchange’ or ‘clinical information exchange’ or ‘health care information exchange’	Keyword	400	23	14
Web of science	‘Health information exchange’ or ‘clinical information exchange’ or ‘health care information exchange’	Topic	408	50	30
Library information science and technology abstracts	‘Health information exchange’ or ‘clinical information exchange’ or ‘health care information exchange’	Keyword	81	70	2
EMBASE	‘Health information exchange’ or ‘clinical information exchange’ or ‘health care information exchange’	Keyword	460	293	69
CINAHL plus	‘Health information exchange’ or ‘clinical information exchange’ or ‘health care information exchange’	Keyword	230	167	9