1. Institute for Marine Biosciences, National Research Council, Halifax, Nova Scotia, Canada
2. Analytical Toxicology, Cornell University, Ithaca, New York, USA
3. Sandoz Pharmaceuticals Corporation, East Hanover, New Jersey, USA
4. U. S. Environmental Protection Agency EMSL, Cincinnati, Ohio, USA
5. Merck Research Laboratories, West Point, Pennsylvania, USA
6. U. S. Food and Drug Administration, Washington, DC, USA
7. Goldman Associates International, Herndon, Virginia, USA