[1] Univ Hosp Freiburg, Div Renal, D-79106 Freiburg, Germany
[2] Univ Hosp Muenster, Div Mol Nephrol, Munster, Germany
[3] Univ Freiburg, Ctr Biol Signalling Studies Bioss, Freiburg, Germany
[4] Univ Hosp Muenster, Div Mol Nephrol, Dept Internal Med D, D-48149 Munster, Germany