1. Maine Bureau of Health, Division of Disease Control, Augusta, Maine, Connecticut Department of Public Health, Hartford, Connecticut
2. Maine Bureau of Health, Division of Disease Control, Augusta, Maine, Pennsylvannia Department of Health, Harrisburg, Pennsylvania
3. University of Massachusetts, School of Public Health and Health Services, Department of Biostatistics and Epidemiology, Amherst, Massachusetts
4. Foundation for Blood Research, Scarborough, Maine