Consultant of gastroenterology and endoscopy of the digestive system, liver and nutrition for children specialised in poor growth – recurrent abdominal pain – chronic constipation – chronic diarrhea – Gastroesophageal reflux disease (GERD) – gastrointestinal bleeding – food allergy – Coeliac disease – Colitis – Peptic ulcers – gastritis – Helicobacter pylori – malnutrition in children – jaundice – hepatitis and pancreatic diseases – cases after liver transplant