1. Nephrology Department, Hospital Universitario Nuestra Señora de Candelaria (HUNSC), Santa Cruz de Tenerife, Spain
2. Research Unit, HUNSC, Santa Cruz de Tenerife, Spain
3. Clinical Analysis Service, HUNSC, Santa Cruz de Tenerife, Spain
4. Nephrology Department, Complejo Hospitalario Universitario de Albacete, Albacete, Spain
5. Research Unit, Hospital Universitario de Canarias, La Laguna, Spain