1. Department of Pathology; University of Washington Medical Center; Seattle WA USA
2. Department of Internal Medicine; University of Washington School of Medicine; Seattle WA USA
3. Departments of Family Medicine and Public Health & Preventive Medicine; Oregon Health & Science University; Portland OR USA
4. Department of Pathology; University of Vermont College of Medicine and Vermont Cancer Center; Burlington VT USA
5. Department of Pathology; Beth Israel Deaconess Medical Center; Boston MA USA
6. Department of Laboratory Medicine; Keenan Research Centre of the Li Ka Shing Knowledge Institute; St Michael's Hospital; University of Toronto; Toronto ON Canada
7. Department of Family Medicine; Health Promotion Research; University of Vermont; Burlington VT USA