1. Poggensee, G. & Feldmeier, H. Acta Trop. 79, 193–210 (2001).
2. Chitsulo, L. et al. Acta Trop. 77, 41–51 (2000).
3. Murray, C. J. L. & Lopez, A. D. (eds) in The Global Burden of Disease (Harvard Univ. Press, 1996).
4. WHO Technical Report Series 912: prevention and control of schistosomiasis and soil-transmitted helminthiasis (WHO, Geneva, 2002).
5. WHO World Health Report (WHO, Geneva, 2002).