1. Department of Speech and Language Therapy and Voice Production, Institute of Applied Polish Studies, Warsaw University, Krakowskie Przedmieście 26/28, 00-927 Warszawa, Poland
2. Department of Computer Science, State Higher Vocational School in Tarnów, Mickiewicza 8, 33-100 Tarnów, Poland
3. Institute of Applied Linguistics, Adam Mickiewicz University in Poznań, al. Niepodległości 4, 61-874 Poznań, Poland