1. Centre for International Health, Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway, Department of Occupational Medicine, Haukeland University Hospital, Bergen, Norway
2. Department of Clinical Science, University of Bergen, Bergen, Norway
3. Unit of Epidemiology and Medical Statistics, Department of Diagnostics and Public Health, University of Verona, Verona, Italy
4. Centre for International Health, Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
5. Division of Inflammation and Infection, Department of Biomedical and Clinical Sciences, Faculty of Medicine and Health Sciences, Linköping University, Linköping, Sweden
6. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa, Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK