Lung Diseases, Obstructive

• Research Site — Tuscumbia, Alabama, United States
• Research Site — Fort Smith, Arkansas, United States
• Research Site — Long Beach, California, United States
• Research Site — Orange, California, United States

• Research Site — Abbeville, France
• Research Site — Agen, France
• Research Site — Ajaccio, France
• Research Site — Albi, France

• Research Site — Quillota, Chile
• Research Site — Valparaíso, Chile
• Researh Site — Dubrovnik, Croatia
• Research Site — Split, Croatia

• Research Site — Lund, Sweden
• Research Site — Nottingham, United Kingdom

• Research Site — Copenhagen, Denmark

• Research Site — Alingsås, Sweden
• Research Site — Angered, Sweden
• Research Site — Arlöv, Sweden
• Research Site — Arvidsjaur, Sweden

Not specified

• Research Site — Mar del Plata, Buenos Aires, Argentina
• Research Site — Monte Grande, Buenos Aires, Argentina
• Research Site — Córdoba, Córdoba Province, Argentina
• Research Site — Santa Fe, Santa Fe Province, Argentina

• Firestone Institute for Respiratory Health, St. Joseph's Healthcare — Hamilton, Ontario, Canada

• Hopital Laval — Ste-Foy, Quebec, Canada