1. Agency for Toxic Substances and Disease Registry/Centers for Disease Control and Prevention, Atlanta, GA, USA,
2. McKing Consulting Corporation, Atlanta, GA, USA,
3. The ALS Association, Washington, DC, USA,
4. Muscular Dystrophy Association, Chicago, IL, USA,
5. Les Turner ALS Foundation, Chicago, IL, USA,
6. Duke University ALS Clinic, Durham, NC, USA, and
7. Diagnosed with ALS, Atlanta, GA, USA