Affiliation: | 1. Department of Medical Education, Baskent University Faculty of Medicine, Ankara, Turkey;2. Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA;3. Department of Radiology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA;4. Department of Pulmonary and Critical Care Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA, USA;5. Department of Epidemiology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA |