1. Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, OH, USA;
2. Department of Internal Medicine (Pulmonary Division), University of Cincinnati College of Medicine, Cincinnati, OH, USA;
3. Department of Radiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA;
4. Department of Radiology, King’s Daughters Medical Center, Ashland, KY, USA;
5. Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA