1. Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, Berkeley, California, USA
2. Centre for International Health, University of Bergen, Bergen, Norway
3. Department of Infectious Disease Epidemiology, Statens Serum Institut, Copenhagen, Denmark
4. Department of Microbiology and Infection Control, University Hospital of North Norway, Tromsø, Norway
5. Child Health Department, Institute of Medicine, Tribhuvan University, Kathmandu, Nepal
6. Medical Microbiology, Department of Laboratory Medicine, Innlandet Hospital Trust, Lillehammer, Norway
7. Division of Infectious Disease Control, Norwegian Institute of Public Health, Oslo, Norway