[1] Univ Munich, Comprehens Pneumol Ctr, German Ctr Lung Res, Dept Internal Med 5, Munich, Germany
[2] Univ Klinikum Heidelberg, Pneumol & Beatmungsmed, Heidelberg, Germany
[3] Univ Klinikum Leipzig, Leipzig, Germany
[4] Sch Med, Hannover, Germany
[5] German Rheuma Res Ctr, Berlin, Germany
[6] Fachkrankenhaus Coswig, Coswig, Germany
[7] Lungenfachklinik, Immenhausen, Germany
[8] Univ Munich, Munich, Germany
[9] LungenClinic, Grosshansdorf, Germany
[10] Evangel Lungenklin, Berlin, Germany
[11] Univ Klinikum Saarland, Homburg, Germany
[12] Krankenhaus Bethanien, Solingen, Germany
[13] Tech Univ Dresden, Fac Med, Dresden, Germany