1. Infectious Diseases Service, Hospital Clinic-IDIBAPS, University of Barcelona, Barcelona, Spain.
2. Nephrology Service, La Princesa University Hospital, Madrid, Spain.
3. Renal Transplant and Nephrology Service, Hospital Clinic-IDIBAPS, Barcelona, Spain.
4. Nephrology Service, Hospital Ramon y Cajal, Madrid, Spain.
5. Nephrology Service, La Paz University Hospital, Madrid, Spain.
6. Nephrology Service, Puerta del Mar University Hospital, Cadiz, Spain.
7. Nephrology Service, Hospital General de Elche, Elche, Spain.
8. Nephrology Service, Hospital de Cruces, Baracaldo, Spain.
9. Nephrology Service, Hospital de Donostia, San Sebastian, Spain.
10. Nephrology Service, Bellvitge University Hospital, Hospitalet del Llobregat, Barcelona, Spain.
11. AEC-GESIDA, Madrid, Spain.