[1] Univ Freiburg, Med Ctr, Clin Pneumol, Freiburg, Germany
[2] Univ Freiburg, Med Ctr, Clin Pneumol, Freiburg, Germany
[3] Univ Hosp, Clin Resp Med & Pulm Cell Res, Basel, Switzerland
[4] Univ Basel, Dept Biomed, Basel, Switzerland
[5] Lindenhof Hosp, Bern, Switzerland
[6] Univ Hosp Basel, Clin Resp Med & Pulm Cell Res, Basel, Switzerland
[7] Univ Liege, Pneumol Dept, CHU Liege, Liege, Liege, Belgium
[8] Univ Basel, Dept Biomed, Basel, Switzerland