1. VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, Tietotie 2, Espoo FI-02044 VTT, Finland
2. Institute
of Biomedicine and Biocenter of Oulu, Medical Research Centre Oulu, Oulu University Hospital, 90220 Oulu, Finland
3. Department
of Pediatric Gastroenterology and Metabolic Diseases, Poznan University of Medical Sciences, 61-701 Poznan, Poland