1. Food and Nutrition Science, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
2. Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
3. Department of Paediatrics, Institute of Clinical Sciences, University of Gothenburg, Gothenburg, Sweden
4. Paediatric Clinic, Skaraborg Hospital, Lidköping, Sweden
5. Clinical Bacteriology Section, Department of Infectious Diseases, University of Gothenburg, Gothenburg, Sweden