1. Dr. Rivera is the Director of the Laboratory Animal House at the University of Goias. Universidade Federal de Goias - Campus Samambaia - Instituto de Ciencias Biologicas Golania, GO Brazil.
2. Dr. Hernandez, Universidad Nacional Autonoma de Mexico - FACULTAD DE VETERINARIA, Coyoacan, Distrito Federal Mexico.
3. Dr. Carissimi, Universidade Federal do Rio Grande do Sul - FACULDADE DE VETERINARIA, Porto Alegre, RS Brazil.
4. Cynthia Pekow, Chief, Veterinary Medical Unit Veterans Affairs Puget Sound Health Care System Seattle, Washington.