1. Department of Microbiology and Immunology Institute of Biomedicine Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
2. Department of Molecular and Clinical Medicine Institute of Medicine Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
3. Chalmers Mass Spectrometry Infrastructure Department of Biology and Biological Engineering Chalmers University of Technology Gothenburg Sweden
4. Center for Functional GI and Motility Disorders University of North Carolina Chapel Hill North Carolina USA