1. Geriatric Unit, Department of Palliative Medicine, Poznań University of Medical Sciences, 61-245 Poznań, Poland
2. Department of Occupational Therapy, Poznań University of Medical Sciences, 60-781 Poznań, Poland
3. Department of Immunobiology, Poznań University of Medical Sciences, 60-806 Poznań, Poland
4. Department of Infectious Diseases, Józef Struś Hospital, 61-285 Poznań, Poland
5. Department of Human Nutrition and Dietetics, Poznań University of Life Sciences, 60-624 Poznań, Poland