1 Unit of Medical Anthropology, Institute of Tropical Medicine, Antwerp 2000, Belgium.
2 Centre de Formation et de Recherche en Santé Rurale de Maferinyah, Forecariah, Guinea.
3 Medical Research Council Unit, Fajara, The Gambia; London School of Hygiene & Tropical Medicine, London, UK.
4 Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp 2000, Belgium.
5 Unit of Medical Anthropology, Institute of Tropical Medicine, Antwerp 2000, Belgium; School of International Health Development, Nagasaki University, Nagasaki, Japan; Partners for Applied Social Sciences International, Tessenderlo, Belgium. Electronic address: kpeeters@itg.be.