1. TI Food and Nutrition, Wageningen, The Netherlands, Laboratory of Microbiology, Wageningen University, The Netherlands
2. TI Food and Nutrition, Wageningen, The Netherlands, erwin.zoetendal@wur.nl, Laboratory of Microbiology, Wageningen University, The Netherlands
3. TI Food and Nutrition, Wageningen, The Netherlands, TNO Quality of Life, Zeist, The Netherlands
4. TI Food and Nutrition, Wageningen, The Netherlands, Department of Basic Veterinary Medicine, Helsinki University, Helsinki, Finland