1. Department of Health Sciences, University of Florence, 50134 Florence, Italy
2. Department of Biomedicine and Prevention, University of Rome Tor Vergata, 00133 Rome, Italy
3. Department of Nursing and Obstetrics, Wroclaw Medical University, 50-367 Wroclaw, Poland
4. Unità di Medicina Interna, Ospedale S. Pertini, 00157 Rome, Italy
5. School of Nursing, University of Pennsylvania, Philadelphia, PA 19104, USA
6. Mary MacKillop Institute for Health Research, Australian Catholic University, Fitzroy, VIC 3065, Australia
7. Center for Home Care Policy & Research, VNS Health, New York, NY 10017, USA