The syndrome of Kaposi's sarcoma and opportunistic infections: an epidemiologically restricted disorder of immunoregulation: Ann. Int. Med.: T. lymphocyte subpopulations in patients with classic hemophilia treated with cryoprecipitate and lyophilized concentrates: N. Engl. J. Med.: Impaired cell-mediated immunity in patients with classic hemophilia: N. Engl. J. Med.: Acquired immunodeficiency-like syndrome in two haemophiliacs: Lancet: Spread of AIDS sparks new health concern: Science: Health officials seek ways to halt AIDS: Science