[1] Harvard Univ, Brigham & Womens Hosp, Sch Med, Div Pulm & Crit Care Med,Med, Boston, MA 02115 USA
[2] Brigham & Womens Hosp, Radiol, Surg Planning Lab, Lab Math Imaging, Boston, MA 02115 USA
[3] Diagnost VIDA, Coralville, IA USA
[4] Univ Michigan, Med Pulm & Crit Care, Ann Arbor, MI 48109 USA
[5] Univ Alabama Birmingham, Med, Div Pulm Allergy & Crit Care Med, Birmingham, AL USA
[6] Columbia Univ, Dept Med, Med Ctr, New York, NY USA
[7] Columbia Univ, Dept Epidemiol, Med Ctr, New York, NY USA
[8] Temple Univ, Sch Med, Med, Div Pulm & Crit Care Med, Philadelphia, PA 19122 USA
[9] Univ Calif San Diego, Radiol, San Diego, CA 92103 USA
[10] Univ Edinburgh, Queens Med Res Inst, Clin Res Imaging Ctr, Edinburgh, Midlothian, Scotland
[11] Harvard Univ, Brigham & Womens Hosp, Sch Med, Med,Channing Div Network Med, Boston, MA 02115 USA
[12] Natl Jewish Hlth, Radiol, Denver, CO USA
[13] Natl Jewish Hlth, Div Pulm & Crit Care Med, Med, Denver, CO USA