[1] Univ Poitiers, Ctr Hosp Henri Laborit, Unite Rech Clin, 370 Ave Jacques Coeur,CS 10587, F-86021 Poitiers, France
[2] CHR Metz Thionville, Serv Pneumol, F-57038 Metz, France
[3] Ctr Tabacol, Dispensaire Emile Roux, F-63100 Clermont Ferrand, France