[1] Univ Hosp Regensburg, Dept Internal Med 2, Franz Josef Strauss Allee 11, D-93055 Regensburg, Germany
[2] Univ Hosp Regensburg, Dept Nephrol, Regensburg, Germany
[3] Univ Regensburg, Dept Genet Epidemiol, Regensburg, Germany
[4] Univ Hosp Regensburg, Dept Biometry, Ctr Clin Studies, Regensburg, Germany
[5] Allgemeine Ortskrankenkasse Bayern, Supply Management, Munich, Germany
[6] Allgemeine Ortskrankenkasse Bayern, Munich, Germany
[7] Techniker Krankenkasse, Dis Management, Hamburg, Germany
[8] Techniker Krankenkasse, Hamburg, Germany
[9] Deutsch Angestellten Krankenkasse, Supply Management, Bremen, Germany
[10] Barmer GEK, Berlin, Germany
[11] IKK Class, Dresden, Germany