1. Collegium Medicum, The Mazovian University in Płock, 09-402 Płock, Poland
2. Department of Health Economics and Medical Law, Medical University of Warsaw, 02-091 Warsaw, Poland
3. Department of Internal Medicine, Provincial Hospital in Płock, 09-400 Płock, Poland
4. Faculty of Health Sciences Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, 87-100 Toruń, Poland
5. Department of Integrated Medical Care, Faculty of Health Sciences, Medical University of Bialystok, 15-096 Bialystok, Poland