Table 1.

Quality assessment

		Qualitative research methods						Quantitative research methods
Author	Year of publication	Clear objective	Selection of study participants	Methods	Data collection	Analysis of data	Clear presentation results	Specific objective/hypothesis	Inclusion participant	Definition of outcome	Description methods and measurement	Risk of recollection bias	Participants	Presentation of results
Sánchez López et al20	2010	+	±	±	±	±	+
Carlsen and Norheim17	2008	+	+	+	+	+	+
Yew and reid16	2008	+	+	+	+	+	+
Hannes et al15	2005	+	+	+	+	+	+
Tracy et al14	2003	+	+	+	+	+	+
Freeman34	2001	+	+	+	+	±	+
Cranney et al13	2001	+	+	+	+	+	+
Oswald and Bateman19	2000	+	±	+	±	–	–
Mayer and Piterman18	1999	+	+	+	+	±	+
Kahveci and Meads32	2009							+	±	+	±	n/a	±	+
Barghouti et al31	2009							+	±	+	±	n/a	±	+
Trevena et al30	2007							±	±	+	+	n/a	±	+
Amin et al29	2006							±	±	±	±	n/a	±	±
Upton and Upton28	2006							+	+	+	+	n/a	±	+
Chan and Teng21	2005							+	+	+	+	n/a	+	+
Butzlaff et al23	2004							+	±	+	–	n/a	±	–
McKenna et al27	2004							+	+	+	+	n/a	±	±
Taylor et al26	2002							±	±	+	±	n/a	±	±
Cotton and Sullivan25	1999							+	+	+	+	n/a	±	+
McColl et al24	1998							+	+	+	±	n/a	+	+
Gupta et al22	1997							+	+	+	+	n/a	+	+
Young and Ward33	2001	+	±	±	-	-	-	+	±	+	+	n/a	+	+

Opinion of the reviewers about the quality of this item: + = positive, ± = neutral, – = negative, n/a= not applicable (cross-sectional studies).