[1] Erasmus Univ, Med Ctr, Dept Resp Med, Rotterdam, Netherlands
[2] Kings Coll London, Div Asthma Allergy & Lung Biol, London, England
[3] Univ Catania, Dept Clin & Expt Med, Sect Resp Dis, Catania, Italy
[4] Royal Brampton Hosp, Interstitial Lung Dis Unit, London, England
[5] Imperial Coll London, Natl Heart & Lung Inst, London, England
[6] Claude Bernard Lyon 1 Univ, Hosp Civils Lyon, Louis Pradel Hosp, Dept Resp Med, Lyon, France