1. Department of Medicine,
2. Department of Environmental and Occupational Health Sciences, and
3. Department of Epidemiology and Environmental Health, University at Buffalo, Buffalo, New York;
4. Department of Biostatistics, University of Washington, Seattle, Washington;
5. Department of Radiology, University of Iowa, Iowa City, Iowa;
6. Department of Medicine and
7. Department of Epidemiology, Columbia University, New York, New York; and
8. Department of Medicine, McGill University, Montreal, Quebec, Canada