1. Department of Inherited Metabolic Diseases; Research Center for Medical Genetic; Moscow; Russian Federation
2. Center for Medical Genetics; Vilnius University Hospital Santariskiu Klinikos; Vilnius; Lithuania
3. Centre for Medical Genetic Services; Institute for Hereditary Diseases; Minsk; Belarus
4. Department of Cardiology; Gliwice General Hospital; Gliwice; Poland
5. Department of Paediatric Pulmonology and Rheumatology; Medical University of Lublin; Lublin; Poland
6. Department of Molecular Biology; University of Gdańsk; Gdańsk; Poland
7. Department of Metabolic Diseases; The Children's Memorial Health Institute; Warsaw; Poland