1. Functional Foods Forum, University of Turku, FI-20014 Turku, Finland
2. Laboratory of Microbiology, Wageningen University, 6703 HB Wageningen, The Netherlands
3. Department of Pediatrics, University of Turku, FI-20014 Turku, Finland
4. Department of Basic Veterinary Sciences, Helsinki University, FI-00014 Helsinki, Finland