1. Department of Nephrology, Hospital Central Defense Gomez Ulla, 28047 Madrid, Spain
2. Department of Nephrology, Clínica Universidad de Navarra, 31008 Pamplona, Spain
3. Department of Nephrology, Hospital General Elche, 03203 Elche, Spain
4. Department of Nephrology, Hospital Fuensanta, 28942 Madrid, Spain
5. Department of Nephrology, Hospital Universitario Doctor Negrin de Gran Canarias, 35016 Las Palmas de Gran Canarias, Spain
6. Department of Nephrology, Hospital Universitario General Villalba, 28400 Madrid, Spain
7. Department of Cardiology, Central Defense Gomez Ulla Hospital, 28047 Madrid, Spain
8. Teaching Coordination Unit, Universidad Peruana Cayetano Heredia, Lima 15012, Peru
9. Department of Nephrology, Hospital San Pedro de Alcántara, 10003 Cáceres, Spain