1. Nephrology and Dialysis Unit; “S. Maria della Scaletta” Hospital; Imola Bologna Italy
2. Dialysis Unit; “ASST Milano Ovest”; Magenta Milan Italy
3. Internal Medicine Unit; “ASST Milano Ovest”; Magenta Milan Italy
4. Nephrology and Dialysis Unit; “Cardinale G. Panico” Hospital; Tricase Lecce Italy