1. Department of Medical Genetics, Faculty of Medicine, Medical University of Sofia, Sofia, Bulgaria;
2. Genome laboratory, SBALGAR Clinic Malinov, Sofia, Bulgaria;
3. Department of Genetics, Faculty of Biology, Sofia University St Kliment Ohridski, Sofia, Bulgaria;
4. Department of Biology, Medical Genetics and Microbiology, Faculty of Medicine, Sofia University St Kliment Ohridski, Sofia, Bulgaria;
5. Bulgarian Academy of Sciences (BAS), Sofia, Bulgaria