[1] Univ Bretagne Occidentale, GETBO, EA 3878, F-29609 Brest, France
[2] CHRU Brest, Dept Med Interne & Pneumol, F-29609 Brest, France
[3] Univ Ottawa, Ottawa Hosp, Res Inst, Ottawa, ON K1V 9W8, Canada
[4] Hop Europeen Georges Pompidou, Serv Pneumol, F-75015 Paris, France
[5] Univ Paris 05, Sorbonne Paris Cite, F-75006 Paris, France
[6] CHRU Brest, Hop Cavale Blanche, Ctr Invest Clin, F-29609 Brest, France