[1] Ludwig Maximilians Univ Munchen, Univ Hosp, Dept Med 5, Munich, Germany
[2] Hannover Med Sch, Dept Resp Med, Hannover, Germany
[3] Clin Res Ctr Resp Med, Mainz, Germany
[4] Hannover Med Sch, Dept Resp Med, Hannover, Germany
[5] IKF Pneumol Mainz, Mainz, Germany