MorganD.L., KreugerR.A.When to use focus groups and why. In: MorganD.L., ed. Successful Focus Groups.London: Sage, 1993
2.
BoyntonP.M., GreenhalghT.Selecting, designing, and developing your questionnaire.BMJ2004; 328: 1312–15
3.
AdamsA.S., SoumeraiS.B., LomasJ., Ross-DegnanD.Evidence of self-report bias in assessing adherence to guidelines.Int J Qual Health Care1999; 11: 187–92
4.
SchroterS., TiteL.Open access publishing and author-pays business models: a survey of authors’ knowledge and perceptions.J R Soc Med2006; 99: 141–8
5.
MeyersB.Open access: a matter for definition.Society for Scholarly Publishing. Issue Status Report, June 2004. [www.sspnet.org/i4a/pages/Index.cfm?pageid3571] Accessed 31 January 2006
6.
CuervoL.G., AronsonJ.K.The road to health care.BMJ2004; 329: 1–2