[1] Univ Hosp, Dept Internal Med 1, Cologne, Germany
[2] Univ Hosp, Dept Internal Med, Ulm, Germany
[3] Tech Univ, Inst Med Stat & Epidemiol, Munich, Germany
[4] Hospital, Dept Internal Med, Frankfurt, Germany
[5] Hospital, Dept Internal Med, Hamm, Germany
[6] ISP Naegelsbacherstr, Erlangen, Germany
[7] Univ Hosp, Dept Internal Med, Kiel, Germany