1. Pediatric Clinic, University Hospital Alexandrovska Sofia Bulgaria
2. Pediatric Department Medical University Sofia Sofia Bulgaria
3. University Specialized Hospital for Active Treatment in Obstetrics and Gynecology, 'Maichin dom', National Genetic Laboratory Sofia Bulgaria
4. Medical University Sofia Sofia Bulgaria
5. Department of Biology and Medical Genetics University Hospital Motol Prague Czech Republic
6. Faculty of Medicine of Charles University Prague Czech Republic