[1] Univ Saarland, Sch Med, Homburg, Germany
[2] Univ Leipzig, Inst Med Informat Stat & Epidemol, Leipzig, Germany
[3] Klinikum Chemnitz, Klin Innere Med 3, Chemnitz, Germany
[4] Univ Hosp Ulm, Dept Internal Med, Ulm, Germany
[5] Univ Clin Giessen Marburg, Marburg, Germany
[6] Univ Med Ctr Gottingen, Gottingen, Germany
[7] Univ Hosp Munich, Munich, Germany
[8] Medn Uniklin Tuebingen, Tubingen, Germany
[9] Univ Cologne, Cologne, Germany
[10] Asklepios Hosp St Georg, Hamburg, Germany
[11] Stadt Klinikum Neuss Lukaskrankenhaus GmbH, Dept Med 2, Neuss, Germany
[12] Krankenhaus Barmherzigen Brueder, Trier, Germany
[13] Univ Saarland, Sch Med, Homburg Saar, Germany