1. Department of Cystic FibrosisInstitute of Mother and Child Warsaw Poland
2. Warsaw Cystic Fibrosis CentreDziekanow Lesny Paediatric Hospital Lomianki Poland
3. MedGen Medical Centre Warsaw Poland
4. Department of Screening and Metabolic DiagnosticsInstitute of Mother and Child Warsaw Poland
5. Department of Medical GeneticInstitute of Mother and Child Warsaw Poland