1. a Department of Occupational and Environmental Health, Department of Epidemiology , College of Public Health, University of Iowa , Iowa City , Iowa , USA
2. b Department of Epidemiology and Community Medicine, Faculty of Medicine , University of Ottawa , Ottawa , Ontario , Canada
3. c McLaughlin Centre for Population Health Risk Assessment, University of Ottawa , Ottawa , Ontario , Canada
4. d Biostatistics Branch, Division of Cancer Epidemiology and Genetics National Cancer Institute , Washington , DC , USA
5. e Healthy Environments and Consumer Safety Branch, Health Canada , Ottawa , Ontario
6. f Occupational Epidemiology Branch, Division of Cancer Epidemiology and Genetics , National Cancer Institute , Washington , DC , USA
7. g Faculty of Medicine, University of Manitoba , Winnipeg , Manitoba , Canada
8. h Department of Health and Senior Services , Cancer Epidemiology , Trenton , New Jersey , USA
9. i Radiation Protection Bureau, Health Protection Branch, Health Canada , Ottawa , Ontario , Canada
10. j Department of Epidemiology , College of Public Health, University of Iowa , Iowa City , Iowa , USA
11. k Department of Family and Preventive Medicine , University of Utah , Salt Lake City , USA
12. l Epidemiology Branch, National Institute of Environmental Health Sciences , Research Triangle Park , North Carolina , USA
13. m Department of Physics , St. John’s University , Collegeville , Minnesota , USA
14. n School of Medicine, Yale University , New Haven , Connecticut , USA
15. o Biostatistics Branch, National Institute of Environmental Health Sciences , Research Triangle Park , North Carolina , USA