1. Department of Clinical Research, Basel Institute for Clinical Epidemiology and Biostatistics, University Hospital Basel, Switzerland
2. Department of Clinical Epidemiology & Biostatistics, McMaster University, Ontario, Canada
3. Department of Internal Medicine, St. Antonius Hospital, Nieuwegein
4. Department of Pulmonology, Spaarne Gasthuis Hospital, Hoofddorp, The Netherlands
5. Department of Pulmonology, Respiratory Institute, Hospital Clinic of Barcelona, Institut d’Investigacions Biomèdiques August Pi i Sunyer, Ciber de Enfermedades Respiratorias, University of Barcelona
6. Department of Respiratory Medicine, Hospital Universitari de Bellvitge, Institut d’Investigació Biomèdica de Bellvitge, University of Barcelona, Spain
7. Department of Pneumology and Respiratory Intensive Care Unit, University Hospital of Cattinara, Trieste, Italy
8. Department of Medicine, Division of Pulmonary and Critical Care Medicine, Memphis Veterans Affairs Medical Center, Tennessee
9. Endocrinology, Diabetology and Metabolism, Department of Internal Medicine and Department of Clinical Research, University Hospital Basel
10. Medical University Clinic, Kantonsspital Aarau, Switzerland
11. Department of Medicine, University of Toronto, Ontario, Canada
12. Department of Pulmonary Diseases, Noordwest Hospital Alkmaar, The Netherlands