1. Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
2. Division of Gastroenterology, BC Children’s Hospital, University of British Columbia, Vancouver, British Columbia, Canada
3. Department of Viral and Microbiological Diagnostics, Statens Serum Institut, Copenhagen, Denmark
4. Department of Gastroenterology, Hvidovre University Hospital, Copenhagen, Denmark
5. Department of Clinical Microbiology, Hvidovre University Hospital, Copenhagen, Denmark