1. Department of Nephrology, Hospital Vall d'Hebron , Barcelona , Spain
2. Hospital Duran i Reynalds, ICO, Hospitalet , Spain
3. Department of Hematology, Hospital Vall d'Hebron , Barcelona , Spain
4. Department of Nephrology, Hospital 12 de Octubre , Madrid , Spain
5. Department of Hematology, Hospital 12 de Octubre , Madrid , Spain
6. Department of Nephrology, Hospital del Mar , Barcelona , Spain