[1] Karolinska Inst, Sect Resp Med, Dept Med Solna, Stockholm, Sweden
[2] Karolinska Inst, Ctr Mol Med, Stockholm, Sweden
[3] Karolinska Univ Hosp Solna, Div Resp Med & Allergy, Stockholm, Sweden
[4] Univ Hosp Modena, Ctr Rare Lung Dis, Modena, Italy
[5] Kings Coll London, Div Asthma Allergy & Lung Biol, London, England
[6] San Giuseppe Hosp Multimed, Sect Resp Med, Milan, Italy
[7] Heidelberg Univ, Heidelberg, Germany
[8] Heidelberg Univ, Div Resp Med, Ctr Interstitial & Rare Lung Dis, Heidelberg, Germany