1 Department of Nephrology and Kidney Transplantation, Hospital Clinic of Barcelona, Barcelona, Spain.
2 Department of Nuclear Medicine, Hospital Clinic of Barcelona, Barcelona, Spain.
3 Department of Pathology, Hospital Clinic of Barcelona, Barcelona, Spain.
4 Laboratori Experimental de Nefrologia i Trasplantament (LENIT), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.
5 Red de Investigación Renal (REDINREN), Madrid, Spain.