1. Centers for Disease Control and Prevention, Atlanta, Georgia 30341
2. New Mexico Department of Health, Santa Fe, New Mexico 87502
3. Idaho Department of Health and Welfare, Boise, Idaho 83720
4. EPA Region 10 Laboratory, Port Orchard, Washington 98366
5. Iowa Department of Public Health, Des Moines, Iowa 50319
6. Colorado Department of Public Health and Environment, Denver, Colorado 80246
7. Tricore Reference Laboratories, Albuquerque, New Mexico 87102