Pulmonary Disease, Chronic Obstructive

• Centre for Health Sciences, Queen Mary's School of Medicine and Dentistry, Barts and The London, 2 Newark Street,. — London and Essex, London, United Kingdom

Not specified

• London Chest Hospital — London, United Kingdom

• Edmonton General Hospital, Caritas Lung HEalth Centre — Edmonton, Alberta, Canada

• Dr. Josip Benčević General Hospital — Slavonski Brod, Croatia
• Clinic Hospital Center Zagreb — Zagreb, Croatia

• Acusphere, Inc. — Watertown, Massachusetts, United States

Not specified

• Pfizer Investigational Site — Córdoba, Córdoba Province, Argentina
• Pfizer Investigational Site — San Miguel de Tucumán, Pcia de Tucuman, Argentina
• Pfizer Investigational Site — San Miguel de Tucumán, Pcia de Tucuman, Argentina
• Pfizer Investigational Site — Rosario, Santa Fé, Argentina

• University Medical Center Groningen, Department of Pulmonary Diseases — Groningen, Provincie Groningen, Netherlands

• University of California — San Francisco, California, United States