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Curricular elements of a four-week retention program for incoming medical students. Curricula was designed to combine active learning and more standard elements, and included weekly problem based learning (PBL) cases, didactic lectures, laboratories, and student presentations of a clinical infectious disease case (‘Grand rounds’), (ELISA, enzyme linked immunosorbant assay; GI, gastrointestinal; HIV-1, human immunodeficiency virus −1).
