Bed net ownership in Kenya: the impact of 3.4 million free bed nets. - Hightower A; Kiptui R; Manya A; Wolkon A; Vanden Eng JL; Hamel M; Noor A; Sharif SK; Buluma R; Vulule J; Laserson K; Slutsker L; et al. (Malaria journal, 2010)