1. Department of Cardiology, Hospital Central Defense Gómez Ulla, 28047 Madrid, Spain
2. Department of Nephrology, Hospital Central Defense Gómez Ulla, 28047 Madrid, Spain
3. Department of Nephrology, Hospital Clínico San Carlos, 28040 Madrid, Spain
4. Department of Cardiology, Hospital Clínico San Carlos, 28040 Madrid, Spain
5. Department of Nephrology, Hospital Universitario Puerta del Mar, 11009 Cádiz, Spain
6. Department of Nephrology, Hospital General Elche, 03203 Elche, Spain
7. Department of Nephrology, Clínica Universidad de Navarra, 31008 Navarra, Spain
8. Department of Nephrology, Hospital Universitario General Villalba, 28400 Madrid, Spain