Empirical articles achieving a minimum average score of 10 (of a possible 17) and non-empirical and grey articles scoring a minimum of 5 (of a possible 10; see Additional file 3 for quality rating sheets) were retained.
Additional articles, including grey literature articles, were located through e-mail consultations with a network of experts representing 27 European Union countries.
N.B.: this part of the text should be considered amendable as it refers to the content of a grey text (Article 23 e)).
Quality assessment of additional peer-reviewed process evaluation studies, or grey literature articles, will not be undertaken, as these studies will be used primarily as contextual details in the realist synthesis.
As mentioned in the article, grey squirrel culling can result in lactating mothers being killed, condemning baby squirrels to slowly starve to death.
A primary search of Cumulative Index to Nursing and Allied Health Literature (CINAHL), MEDLINE, EMBASE, PsycINFO, and a secondary search of grey literature and articles taken from references of included articles (from inception to July 2013).
To supplement the database search, a planned hand search of grey literature for articles on PubMed and checking of reference lists of identified articles for relevant studies will be conducted [ 41].
A systematic search of seven databases and the grey literature for articles published January 1989-February 2010 was undertaken.
Studies meeting the following criteria were included: (a) published studies, reviews or discussion papers addressing the review topics; (b) grey literature; (c) articles published in English language; (d) studies originating from Australia, New Zealand, the United Kingdom, Canada, USA, Europe, Japan, Brazil, South Pacific Nations, Thailand, Malaysia, and Myanmar.
We searched electronic databases and grey literature for articles on OF in low-resource countries published between January 1 , 1995 and November 16, 2014, and selected for inclusion 19 articles with original population-based OF incidence or prevalence data and 44 with reports of frequency of SB associated with OF.
