1. Oregon Public Health Division, Portland, Oregon
2. Washington State University, Spokane
3. University of Colorado Anschutz Medical Campus, Aurora
4. University of Massachusetts Amherst, Amherst
5. Washington Poison Center, Seattle, Washington
6. Now at Department of Pediatrics, Section of Pediatric Emergency Medicine, Pharmacology & Toxicology, College of Medicine, University of Arkansas for Medical Sciences, Little Rock