1. Department of Pulmonary Medicine, School of Medicine, Marmara University, Istanbul, Turkey
2. Department of Cardiology, Sahlgrenska University Hospital/Ostra, Gothenburg, Sweden
3. Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
4. Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
5. Department of Clinical Sciences, Respiratory Medicine and Allergology, Faculty of Medicine, Lund University, Lund, Sweden; and
6. Department of Pulmonary Medicine, School of Medicine, Koc University, Istanbul, Turkey