1. Department of Infectious Diseases, Östra Sjukhuset, S-416 85 Gothenburg, Sweden. Author to whom request for reprints should be addressed.
2. Research Fellow at the Department of Pediatrics, University of Addis Ababa and the Ethiopian Nutrition Institute.
3. Associate Professor, Department of Pathology, Lund.
4. Research Associate, Department of Preventive and Social Medicine, University of Umeå.
5. Formerly Director, Ethiopian Nutrition Institute, Addis Ababa, Ethiopia.