1. Research Program for Molecular Medicine and Department of Medical Genetics; Haartman Institute, University of Helsinki; Helsinki; Finland
2. Finnish Red Cross Blood Service; Helsinki; Finland
3. Department of Gastroenterology; Helsinki University Hospital; Helsinki; Finland
4. Pediatric Research Center; University of Tampere and Tampere University Hospital; Tampere; Finland
5. Department of Surgery; Helsinki University Hospital; Helsinki; Finland
6. Department of Medicine; Helsinki University Central Hospital; Helsinki; Finland
7. Department of Gastroenterology and Alimentary Tract Surgery; Tampere University Hospital and School of Medicine, University of Tampere; Tampere; Finland