1. Department of Science and Environment, Roskilde University, Roskilde, Denmark
2. Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
3. Department of Clinical Microbiology, Copenhagen University Hospital—Amager and Hvidovre, Copenhagen, Denmark
4. Department of Gastroenterology, Copenhagen University Hospital—Amager and Hvidovre, Copenhagen, Denmark
5. Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
6. Department of Virus and Microbiological Special Diagnostics, Statens Serum Institut, Copenhagen, Denmark