1. Toxicologist and professor, respectively, Department of Pathology, Medical College of Virginia, Virginia Commonwealth University, Box 98-0165 MCV Station Richmond, VA 23298-0165, US.
2. Senior toxicologist, laboratory supervisor and president, respectively, Harrison Laboratories, Midland, TX, US.
3. Deputy medical examiner, Lubbock County Medical Examiners Office, Lubbock, TX, US.