[1] Univ Gottingen, Dept Nephrol & Rheumatol, D-3400 Gottingen, Germany
[2] Univ Gottingen, Dept Urol, D-3400 Gottingen, Germany
[3] Univ Tubingen, Med Clin, Dept 2, Sect Transplantat Immunol & Immunohaematol, Tubingen, Germany
[4] Humboldt Univ, Charite, Dept Dermatol, Berlin, Germany
[5] Univ Gottingen, Dept Pathol, D-3400 Gottingen, Germany