1. Liverpool School of Tropical Medicine; Cochrane Infectious Diseases Group; Pembroke Place Liverpool UK L3 5QA
2. Oswaldo Cruz Foundation (FIOCRUZ); Vice-Presidency of Research and Biological Collections; Rio de Janeiro Brazil
3. Liverpool School of Tropical Medicine; Department of Clinical Sciences; Liverpool UK
4. James Cook University; College of Public Health, Medical and Veterinary Sciences; PO Box 6811 Cairns Queensland Australia 4870