1. Department of Clinical Nursing, Health Sciences Faculty, Medical University of Warsaw, Warsaw, Poland
2. Department of Geriatrics, Nicolaus Copernicus University in Torun, Collegium Medicum in Bydgoszcz, Bydgoszcz, Poland
3. Institute of Nursing and Midwifery, Faculty of Health Sciences, Jagiellonian University Medical College, Krakow, Poland