1. Swiss Tropical and Public Health Institute; Public Health and Epidemiology; Socinstrasse 57 Basel Switzerland CH-4051
2. Kenya Medical Research Institute - Wellcome Trust Programme; Department of Biosciences; PO Box 230 Kilifi Kilifi Kenya 80108
3. Public Health England North West; Health Protection Team; 2nd Floor, 3 Piccadilly Place London Rd, Manchester UK M1 3BN
4. Liverpool School of Tropical Medicine; Cochrane Infectious Diseases Group; Pembroke Place Liverpool UK L3 5QA