Referencia bibliográfica - Bibliografic Reference

- Schmitt, Conrad J., et al. Medicina y Servicios Médicos. New York: McGraw Hill, Inc.

- Stine, Gerald J. AIDS Update 1997 New Jersey, 1996.

Thanks also to Dr. Tracy Schermer, Dr. Hernando Posada, and Dr. Michael Levine for most generous assistance.
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