1. INRA, UR 910 Ecology and Physiology of the Digestive Tract, F-78350 Jouy-en-Josas, France
2. Department of Biosciences and Nutrition, Karolinska Institute, Huddinge, Sweden
3. Department of Surgery, University Medical Center Utrecht and Department of Medical Microbiology and Immunology, St. Antonius Hospital, Nieuwegein, The Netherlands
4. Department of Physiology and Biochemistry of Nutrition, Max Rubner-Institute, Karlsruhe, Germany
5. Danone Research Center, Palaiseau, France