Pulmonary Disease, Chronic Obstructive

• VA Medical Center — Houston, Texas, United States

• University of California Los Angeles — Los Angeles, California, United States
• National Jewish Medical and Research Center — Denver, Colorado, United States
• University of Florida (Gainesville) — Gainesville, Florida, United States
• University of Florida (Jacksonville) — Jacksonville, Florida, United States

• Pulmonary Institute — Beer Yaakov, Israel

• Prof. Iwona Graelewska Rzymowska — Lodz, Lódz, Poland

• University Hospital Ghent — Ghent, Belgium

• Research Centre on Asthma and COPD - Department of Clinical and Experimental Medicine - Section of Respiratory Disease - University of Ferrara — Ferrara, Italy

Not specified

• Schön Klinik Berchtesgadener Land — Schönau, Bavaria, Germany

• Greater Baltimore Medical Cente — Baltimore, Maryland, United States

• Radboud University, Department of General Medicine — Nijmegen, Netherlands