[1] Charite, Dept Infect Dis & Resp Med, D-13353 Berlin, Germany
[2] Hannover Med Sch, Dept Pulm Med, Hannover, Germany
[3] Charite, Dept Biometry & Clin Epidemiol, D-13353 Berlin, Germany
[4] Med Univ Schleswig Holstein, Inst Social Med, Campus Luebeck, Germany
[5] Univ Ulm, Dept Med Microbiol & Hyg, D-89069 Ulm, Germany