1. Nephrology and Dialysis Department, University Hospital of Siena, Siena - Italy
2. Institute of General Physiology, University of Siena, Siena - Italy
3. Surgical Department, Vascular Surgery Section, University of Siena, Siena - Italy
4. Department of Internal Medicine, Dermatology Section, University of Perugia, Perugia - Italy
5. Department of Internal Medicine and Immunological Science, University of Perugia, Perugia - Italy
6. Department of Internal Medicine, Section of Applied Biochemistry and Nutritional Sciences, University of Perugia, Perugia - Italy
7. Department of Internal Medicine, Section of Biochemistry, University of Siena, Siena - Italy
8. Department of Quantitative Methods, University of Siena, Siena - Italy
9. Institute of Legal Medicine, University of Pisa, Pisa - Italy