Surgery of neonates, congenital malformations of the gastrointestinal tract, problems of chest wall deformity, thoracic surgery including mini-invasive surgery, surgery of the liver, bile duct and pancreas. Anorectal malformations, Hirschsprung´s disease, intersexual problems. Tumours of the liver, kidneys, retroperitoneum and problems of lung metastasis. Paediatric urology. Polytraumas. Participation in the programme of kidney transplantations in children.