1. Department of Health and Behavioral Sciences; University of Colorado; Denver CO USA
2. Department of Infectious Disease Epidemiology; Imperial College London; London UK
3. Library Services; University of Bristol; Bristol UK
4. Institute for Global Health; University College London; London UK
5. Biomedical Research and Training Institute; Harare Zimbabwe
6. Department of Population Health; London School of Hygiene and Tropical Medicine; London UK