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Hebel., R., M., R., J. (1984). A study guide to epidemiology and biostatistics : including 100 multiple-choice questions (Second Edition). Baltmore: Aspen Pub. Inc..

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Hebel., R., M., R., J.. A study guide to epidemiology and biostatistics : including 100 multiple-choice questions. Second Edition Baltmore: Aspen Pub. Inc., 1984. Text.