[1] Univ Barcelona, Hosp Clin, Dept Nephrol, Inst Invest Biomed August Pi & Sunyer, E-08036 Barcelona, Spain
[2] Univ Barcelona, Hosp Clin, Dept Genet, Inst Invest Biomed August Pi & Sunyer, E-08036 Barcelona, Spain
[3] Hosp Ramon y Cajal, Dept Mol Genet, E-28034 Madrid, Spain