1. Laboratorio de Biología Celular y Retrovirus, Hospital de Pediatría “Prof. Dr. Juan P. Garran,” Buenos Aires, Argentina.
2. Consejo Nacional de Investigaciones Científicas y Tecnológicas, Buenos Aires, Argentina.
3. National Reference Center for AIDS, University of Buenos Aires, Buenos Aires, Argentina.
4. Veterans Administration Research Center for AIDS and HIV-1 Infection, South Texas Veterans Health Care System and Department of Medicine, University of Texas Health Science Care at San Antonio, San Antonio, Texas.
5. Servicio de Infectología, Hospital de Pediatría “Prof. Dr. Juan P. Garrahan,” Buenos Aires, Argentina.