1. Litron Laboratories Rochester New York USA
2. Department of Pediatrics Baylor College of Medicine, Texas Children's Hospital Houston Texas USA
3. Department of Pediatrics University of Rochester Medical Center Rochester New York USA
4. Department of Radiation Oncology University of Rochester Medical Center Rochester New York USA
5. St. George's, University of London London UK
6. Department of Pathology and Laboratory Medicine University of Vermont Burlington Vermont USA
7. Toxicology Consulting Services Bonita Springs Florida USA