1. University of Washington; Department of Medicine, Division of Pulmonary and Critical Care Medicine, and Firland Northwest TB Center; Seattle WA USA
2. McGill University; Department of Epidemiology, Biostatistics and Occupational Health; Montreal Canada
3. University of Washington; Pulmonary and Critical Care Medicine; 325 9th Avenue - Campus Box 359762 Seattle WA USA 98104
4. McGill University Health Centre - Research Institute; Division of Clinical Epidemiology; Montreal QC Canada
5. University of Washington; Department of Global Health; Seattle WA USA
6. FIND; Geneva Switzerland
7. Stellenbosch University; Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences; PO Box 241 Cape Town South Africa 8000
8. Department of Clinical Sciences, Liverpool School of Tropical Medicine; Honorary Research Fellow; Pembroke Place Liverpool UK