Scholte, W.F., Verduin, F., van Lammeren, A., Rutayisire, T. & Kamperman, A.M. (2011). Psychometric properties and longitudinal validation of the self-reporting questionnaire (SRQ-20) in a Rwandan community setting: a validation study. BMC Medical Research Methodology, 11(116). DOI: 10.1186/1471-2288-11-116