Investigation and treatment of various diseases of the digestive system and liver, examination and treatment of diseases of infants, children and adolescents, examination of children's nutrition, including anorexia and anorexia - underweight, feeding and feeding disorders of infants, acute and chronic constipation - acute and chronic and congenital diseases of diarrhea and syphilosis - cyclic syphilosis - recurrent syphilosis, jaundice in children and infants and types of hepatitis, acute pain - chronic abdominal pain - fatty liver and obesity - malnutrition and reduced growth of achalasia and movement disorders of the esophagus and stomach Endoscopy and colonoscopy with anesthesia All types of upper and lower digestive diseases including intestinal and intestinal bleeding and intestinal inflammation and...