1. Department of Clinical Laboratory, Medical University of Sofia; University Hospital “Alexandrovska”, Sofia, Bulgaria
2. Obstetrics and Gynecology, "Dr. Sterev" Hospital, Sofia, Bulgaria
3. University Hospital “Alexandrovska”, Medical University of Sofia, Sofia, Bulgaria
4. Molecular Medicine Centre, Medical University of Sofia, Sofia, Bulgaria
5. Department of Pharmacology and Toxicology, Faculty of Medicine, Medical University of Sofia, Sofia, Bulgaria
6. Department of Medical Genetics, Faculty of Medicine, Medical University of Sofia, Sofia, Bulgaria