1. Department of Clinical Nursing, Faculty of Health Sciences Wroclaw Medical University Bartla 5 Wroclaw 51‐618 Poland
2. William F. Connell School of Nursing Boston College Boston MA USA
3. Centre for Clinical and Basic Research, IRCCS San Raffaele Pisana Rome Italy
4. Oregon Health and Science University School of Nursing Portland OR USA
5. Centre for Heart Diseases Wroclaw Medical University Wroclaw Poland