1. Department of Morphology, Institute of Anatomy and Anthropology, Riga Stradiņš University, Riga, Latvia
2. Institute of Radiation Hygiene and Epidemiology, State Institution – National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, Kyiv, Ukraine
3. Department of Otorhinolaryngology, Riga Stradiņš University, Riga, Latvia