Emphysema

• Luigi Sacco University Hospital, Division of Department of Biomedical and Clinical Sciences, University of Milan — Milan, Italy

• "Victor Babes" University Hospital — Timișoara, Timiș County, Romania

• Aarhus University Hospital — Aarhus, Denmark

• University of Alabama at Birmingham — Birmingham, Alabama, United States
• University of Chicago — Chicago, Illinois, United States
• Northwestern Medicine — Winfield, Illinois, United States
• Henry Ford Hospital — Detroit, Michigan, United States

• Kern Research Inc. — Bakersfield, California, United States
• PulmoCrit Associates — Encino, California, United States
• Torrance Clinical Research Institute — Lomita, California, United States
• Dream Team Clinical Research — Pomona, California, United States

Not specified

• UAB Lung Health Center- Site Number : 105 — Birmingham, Alabama, United States
• St Joseph's Hospital and Medical Center- Site Number : 126 — Phoenix, Arizona, United States
• David Geffen School of Medicine at UCLA- Site Number : 124 — Los Angeles, California, United States
• University of California Davis Medical Center- Site Number : 110 — Sacramento, California, United States

• Karl Landsteiner Institute, Klinik Floridsdorf — Sankt Pölten, Austria
• University Medical Center Groningen — Groningen, GZ, Netherlands
• Royal Brompton Hospital — London, United Kingdom

• Hospital de Clinicas de Porto Alegre — Porto Alegre, Brazil
• Thoraxklinik, University of Heidelberg — Heidelberg, Germany
• University Medical Center Groningen — Groningen, Netherlands

• University of Alabama at Birmingham — Birmingham, Alabama, United States
• University of California Los Angeles — Los Angeles, California, United States
• University of California San Diego — San Diego, California, United States
• Miami University — Miami, Florida, United States