[1] Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA
[2] Univ British Columbia, Dept Med, Vancouver, BC, Canada
[3] Royal Prince Alfred Hosp, Dept Resp Med, Sydney, NSW, Australia
[4] Univ Sydney, Sydney, NSW, Australia
[5] Univ Nottingham Hosp, Div Resp Med, Nottingham, England
[6] Tosei Gen Hosp, Dept Resp Med & Allergy, Aichi, Japan
[7] Columbia Univ, Dept Med, New York, NY USA
[8] Univ Colorado Denver, Dept Med, Aurora, CO USA
[9] Imperial Coll London, Natl Heart & Lung Inst, London, England
[10] Royal Brompton Hosp, Interstitial Lung Dis Unit, London, England
[11] Royal Brompton Hosp, Dept Radiol, London, England
[12] Univ Crete, Fac Med, Dept Resp Med, Iraklion, Greece
[13] Univ Munich, Dept Internal Med 5, Munich, Germany
[14] German Ctr Lung Res, Asklepios Clin, Comprehens Pneumol Ctr Munich, Gauting, Germany
[15] Natl Jewish Hlth, Dept Med, Denver, CO USA
[16] Natl Jewish Hlth, Dept Radiol, Denver, CO USA
[17] Univ Lyon 1, Hosp Civils Lyon, Louis Pradel Hosp, Dept Med, Lyon, France
[18] Univ Michigan, Dept Med, Ann Arbor, MI 48109 USA
[19] Univ Michigan, Dept Pathol, Ann Arbor, MI 48109 USA
[20] Nagasaki Univ, Dept Pathol, Nagasaki, Japan
[21] Kinki Cent Hosp, Dept Radiol, Itami, Hyogo, Japan
[22] Yale Sch Med, Dept Med, Pulm Crit Care & Sleep Med, New Haven, CT USA
[23] Univ Ulsan, Dept Med, Seoul, South Korea
[24] McMaster Univ, Dept Med, Hamilton, ON, Canada
[25] Univ Washington, Dept Med, Seattle, WA 98195 USA
[26] Univ Southampton, Acad Unit Clin & Expt Sci, Southampton, Hants, England
[27] Natl Inst Hlth Res, Southampton Resp Biomed Unit, Southampton, Hants, England
[28] Weill Cornell Univ, Dept Med, New York, NY USA