[1] Lausanne Univ Hosp, Resp Med, CH-1011 Lausanne, Switzerland
[2] Lausanne Univ Hosp, Immunol & Allergy, CH-1011 Lausanne, Switzerland
[3] Univ Lausanne, Inst Work & Hlth, CH-1011 Lausanne, Switzerland
[4] Bern Univ Hosp, Resp Med, CH-3010 Bern, Switzerland
[5] Hop Univ Paris Seine St Denis Avicenne, Resp Med, F-93009 Paris, France