1. Department of Pathology, Republic Center for Thyroid Tumors, Minsk, Belarus.
2. Belarusian Research Center for Pediatric Oncology and Hematology, Childhood Cancer Subregistry of Belarus, Minsk, Belarus.
3. United Institute of Informatics Problems, National Academy of Sciences of Belarus, Minsk, Belarus.
4. Institute of Pathology and Neuropathology, University Hospital of Essen, University of Duisburg-Essen, Essen, Germany.