1. Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, Michigan, USA
2. Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan, USA
3. Department of Environmental and Occupational Health Sciences, University of Washington School of Public Health, Seattle, Washington, USA
4. Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
5. Jorma Gallen-Kallela Memorial Research Library, Helsinki, Finland
6. Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California, USA