Glossary of Methodologic Terms
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چکیده
Before-After Trial: Investigation of therapeutic alternatives in which individuals of 1 period and under a single treatment are compared with individuals at a subsequent time, treated in a different fashion. If the disorder is not fatal and the "before" treatment is not curative, the same individuals may be studied in the before and after periods, strengthening the design through increased group comparability for the 2 periods. See also Crossover Trial.
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