1. Department of Internal Diseases, Gastroenterology and Dietetics North‐Western State Medical University named after I.I. Mechnikov St. Petersburg Russia
2. Department of Microbiology State Research Institute of Highly Pure Biopreparations St. Petersburg Russia
3. Institute of Perinatology and Pediatrics Almazov National Medical Research Centre St. Petersburg Russia
4. Department of Internal Diseases Rīga Stradiņš University Riga Latvia
5. Centre of Gastroenterology, Hepatology and Nutrition Pauls Stradiņš Clinical University Hospital Riga Latvia