1. Department of Virology; The Stephan Angeloff Institute of Microbiology; Bulgarian Academy of Sciences; Sofia Bulgaria
2. Gynecology and Obstetrics Majchin Dom Hospital; Sofia Bulgaria
3. National Institute of Oncology and Hematology; Sofia Bulgaria
4. Tokuda Hospital; Sofia Bulgaria
5. Department of Medical Genetics; Medical University; Sofia Bulgaria
6. Department of Virology; The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences; Sofia Bulgaria