1. AIDS Research Program, Ponce School of Medicine, Ponce, Puerto Rico.
2. Department of Zoology, Government Post Graduate College, Kumaoun University, Pithoragarh, India.
3. Unit of Comparative Medicine, Caribbean Primate Research Center and Animal Research Resources, University of Puerto Rico Medical Science Campus, San Juan, Puerto Rico.
4. Division of Pharmacology, School of Pharmacy, University of Missouri, Kansas City, Kansas.
5. Department of Virology and Immunology, Southwest Foundation for Biomedical Research, San Antonio, Texas.
6. Southwest National Primate Research Center, Southwest Foundation for Biomedical Research, San Antonio, Texas.