[1] CHU Jean Minjoz, Serv Pneumol, F-25000 Besancon, France
[2] Hop Raymond Poincare, F-92380 Garches, France
[3] CHU Hop Nord, Serv Med Travail & Risques Profess, F-38043 Grenoble, France
[4] CHI, Serv Pneumol & Pathol Profess, F-94010 Creteil, France