1. Departments of Medicine University of California, La Jolla
2. Departments of Pathology, University of California, La Jolla
3. San Diego Veterans Affairs Medical Center, California
4. Escuela de Ciencias de la Salud Valle de Las Palmas, Universidad Autónoma de Baja California, Tijuana, Baja California, México
5. School of Community Health Sciences, University of Nevada, Reno
6. Department of Psychiatry, University of California, San Diego, La Jolla