1. Cleveland Clinic, Cleveland, Ohio
2. Department of Internal Medicine V, Ludwig-Maximilians University of Munich, Munich, Germany
3. Asklepios Clinic Gauting, Member of the German Center for Lung Research, Gauting, Germany
4. David Geffen School of Medicine at UCLA, University of California, Los Angeles, Los Angeles, California
5. Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
6. University of Sydney, Sydney, New South Wales, Australia
7. University of Alabama at Birmingham, Birmingham, Alabama
8. Division of Pulmonary and Critical Care Medicine, University of Michigan, Ann Arbor, Michigan
9. Yale University School of Medicine, New Haven, Connecticut
10. National Jewish Health, Denver, Colorado
11. Vanderbilt University Medical Center, Nashville, Tennessee
12. Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, Pennsylvania
13. University of British Columbia, Vancouver, British Columbia, Canada; and
14. University of Minnesota, Minneapolis, Minnesota