1. London School of Hygiene and Tropical Medicine,
2. Centre of Statistics and Applications, University of Lisbon, Portugal;
3. Joint Malaria Programme, Kilimanjaro Christian Medical Centre, Moshi, and
4. Wellcome Trust Sanger Institute, Hinxton, and
5. National Institute for Medical Research, Dar es Salaam, Tanzania
6. Wellcome Trust Centre for Human Genetics, University of Oxford, United Kingdom;