1. Analytical Chemistry Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, US.
2. Biotechnology Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8311 Gaithersburg, MD 20899-8311, US.
3. Head of Research, Development and Defence Projects, The Centre of Forensic Sciences, 25 Grosvenor Street, Toronto, Ontario M7A 2G8, US.
4. Applied Biosystems, 850 Lincoln Centre Drive, Foster City, CA 94404, US.