1 Laboratory of Palliative Medicine, Department of Social Medicine and Public Health, Medical University of Warsaw, Oczki 3, 02‑007, Warsaw, Poland. agnieszka@opiekakluczna.com.pl.
2 Observational and Infectious Disease Ward, Clinical Specialist Hospital in Chorzow, Zjednoczenia 10, 41‑500, Chorzów, Poland.
3 Laboratory of Palliative Medicine, Department of Social Medicine and Public Health, Medical University of Warsaw, Oczki 3, 02‑007, Warsaw, Poland.