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N.A. Christakis, "The Ethical Design of an AIDS Vaccine Trial in Africa" Hastings Center Report, 18(3): 31-37 (June 1988); reprinted in Applied Ethics: A Multicultural Approach, L. May and S.C. Sharratt, eds., Englewood Cliffs, NJ: Prentice-Hall, 1994, p. 421-430