[1] Univ Hosp Cologne, Dept Cardiol, Heart Ctr, Clin Internal Med 3, Kerpener Str 62, D-50937 Cologne, Germany
[2] Univ Cologne, Heart Ctr Univ Cologne, Hosp Cologne, Cologne Cardiovasc Res Ctr CCRC, Cologne, Germany
[3] Hannover Med Sch, Dept Resp Med & Infect Dis, Hannover, Germany
[4] German Ctr Lung Res DZL, Biomed Res Endstage & Obstructive Lung Dis Hannove, Hannover, Germany
[5] Univ Maryland, Sch Med, Dept Med, Baltimore, MD USA
[6] Univ Maryland, Inst Hlth Comp, Bethesda, MD USA