1. Department of Occupational Medicine, Dokuz Eylul University, Faculty of Medicine, Izmir, Turkey
2. Department of Public Health, Dokuz Eylul University, Faculty of Medicine, Izmir, Turkey
3. Department of Public Health, Epidemiology Subsection, Faculty of Medicine, Dokuz Eylul University, Izmir, Turkey
4. Department of Radiology, Dokuz Eylul University, Izmir, Turkey
5. Department of Pulmonary Medicine, Dokuz Eylul University, Izmir, Turkey