1. Department of Veterinary Pathobiology, Faculty of Life Science, Copenhagen University, Frederiksberg, Denmark
2. Department of Microbiology, National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
3. International Escherichia and Klebsiella Centre (WHO), Department of Bacteriology, Mycology, and Parasitology, Statens Serum Institut, Copenhagen, Denmark
4. Department of Epidemiology, Statens Serum Institut, Copenhagen, Denmark