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− | + | For example, a retrospective survey evaluates patient data that has been accumulated over many years. The result of such a study can only be used to a limited extent, as the circumstances under which the data were collected can be very different. |
For example, a retrospective survey evaluates patient data that has been accumulated over many years. The result of such a study can only be used to a limited extent, as the circumstances under which the data were collected can be very different.