1 Unit of Clinical Nutrition, Policlinico University Hospital, Palermo, Italy.
2 Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties, University of Palermo, Palermo, Italy.
3 Department of Clinical and Experimental Medicine, Postgraduate Program in Geriatrics, School of Medicine, University of Catania, Catania, Italy.
4 Section of General Internal Medicine, Geisel School of Medicine, Dartmouth-Hitchcock Medical Center, The Dartmouth Institute for Health Policy & Clinical Practice, Lebanon, New Hampshire, USA.