1. Walter Reed Army Institute of Research, Division of Biochemistry, Department of Biochemical Pharmacology, Silver Spring, MD, 20910-7500, USA
2. Uniformed Services University Health Services, Bethesda, MD, 20814, USA
3. Cholinesterase Reference Laboratory, USACHPPM, Aberdeen Proving Ground, MD, 21010, USA
4. USA Medical Research Institute of Chemical Defense, APG, MD, 21010, USA
5. Memory Disorders Program, Georgetown University, Washington DC, 20057, USA
6. Kumetrix, Inc., Union City, CA, 94587, USA