1. Department of Biomedicine and Prevention , University of Rome Tor Vergata , Roma , Italy
2. Unidad Predepartemental de Enfermería , Universidad de la Rioja , Logroño , Spain
3. Department of Specialistic Medicine , Teaching Hospital Friuli Centrale , Udine , Italy
4. University of Rome Tor Vergata , Roma , Italy
5. Department of Medical, Surgical Science and Advanced Technology “G. Ingrassia” , University of Catania , Catania , Italy