Burkina Faso has approximately 10.5 million inhabitants and is divided into 30 provinces. The study took place in the districts of Tougan, Nouna, and Solenzo, in provinces Sourou and Kossi, in north-west Burkina Faso. There is one medical centre in every district capital and 6 to 14 health centres in the surrounding villages. Each health centre covers a population of 10 000 to 15 000. The staff of one health centre generally consists of one nurse, a nurse aid and a midwife as well as one drug vendor for the nearby village pharmacy. The health personnel are trained and paid by the state.