Kenya National Bureau of Statistics - KNBS, National AIDS Control Council/Kenya, National AIDS/STD Control Programme/Kenya, Ministry of Public Health and Sanitation/Kenya, and Kenya Medical Research Institute. 2010. Kenya Demographic and Health Survey 2008-09. Calverton, Maryland, USA: KNBS and ICF Macro. Available at http://dhsprogram.com/pubs/pdf/FR229/FR229.pdf.