1. Chemistry and Drug Metabolism, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD
2. Department of Clinical Chemistry, Microbiology and Immunology, Ghent University, Ghent, Belgium
3. Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY
4. Norwegian Institute of Public Health, Division of Forensic Toxicology and Drug Abuse, Oslo, Norway
5. Immunalysis Corporation, Pomona, CA
6. Human Pharmacology and Clinical Neurosciences Research Group, IMIM-Hospital del Mar Research Institute, Barcelona, Spain