[1] Royal Brompton Hosp, Interstitial Lung Dis, London, England
[2] Inova Fairfax Heart & Lung Instit, Falls Church, VA USA
[3] Inova Fairfax Hosp, Falls Church, VA USA
[4] Royal Brompton Hosp, Resp, London, England
[5] Cleveland Clin Fdn, 9500 Euclid Ave, Cleveland, OH 44195 USA
[6] Univ Alabama Birmingham, Birmingham Hosp, Birmingham, AL USA
[7] Temple Univ, Philadelphia, PA 19122 USA
[8] Mayo Clin, Rochester, MN USA
[9] King Khalid Univ Hosp, Jeddah, Saudi Arabia
[10] Univ Utah, Salt Lake City, UT USA
[11] Erasmus MC, Pulm Med, Rotterdam, Netherlands
[12] Univ Cincinnati, Med Ctr, Cincinnati, OH 45267 USA