1. Department and Clinic of Palliative Medicine, Poznan University of Medical Sciences, Poznan, Poland.
2. Palliative Medicine In-Patient Unit, University Hospital of Lord's Transfiguration, Poznan University of Medical Sciences, Poznan, Poland.
3. Department of Internal Diseases, Metabolic Disorders and Arterial Hypertension, Poznan University of Medical Sciences, Poznan, Poland.
4. Institute of Applied Linguistics, University of Warsaw, Warsaw, Poland.
5. English Students' Research Association, Poznan University of Medical Sciences, Poznan, Poland.