[1] Hannover Med Sch, Dept Resp Med & Infect Dis, Hannover, Germany
[2] CAPNETZ STIFTUNG, Hannover, Germany
[3] GSK, Brentford, England
[4] GSK, Munich, Germany
[5] Stat Consulting Sci & Res, Berlin, Germany
[6] GSK, Wavre, Belgium
[7] Univ Freiburg, Freiburg, Germany
[8] Univ Hosp Schleswig Holstein, Inst Epidemiol, Kiel, Germany
[9] Goethe Univ Frankfurt, Univ Hosp, Dept Resp Med, Med Clin 1, Frankfurt, Germany