There is a clear lack of studies analysing how different systems of knowledge are interlinked, and what implications the resulting local knowledge has on health resource utilization. Second, there is a lack of studies concerning the sequential or parallel use of healthcare services. Most studies focus on one therapy option (traditional healer or biomedical health facility), but do not follow up therapy paths that include both healthcare sectors (McCombie 1996). Exceptions are the studies by Matthies (1998) and Snow et al. (1992). And third, there is a lack of socio-economic studies, in particular those with a gender focus (Tanner and Vlassoff 1998).