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