[1] CHU Vaudois, Serv Pneumol, Dept Resp Med, CH-1011 Lausanne, Switzerland
[2] Univ Lausanne, CH-1015 Lausanne, Switzerland
[3] CHU Vaudois, Dept Physiotherapy, CH-1011 Lausanne, Switzerland
[4] CHU Vaudois, Inst Social & Prevent Med, CH-1011 Lausanne, Switzerland
[5] CHU Vaudois, Dept Adult Intens Care Med, CH-1011 Lausanne, Switzerland