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To improve the validity of case studies, Barratt and Choi et al. [47] used multiple data collection techniques, i.e., interviews, system demonstrations, site observation and archival documents.
While distraction arthroplasty is an option for cartilage preservation in patients with PTA of the ankle, the technique is highly specialized, which may affect the external validity of case series from specialized Ilizarov centers.
However, a third, more serious problem exists that can affect the validity of case mix adjustment.
It promises, first, to increase the external validity of case studies.
We systematically reviewed the literature to assess the validity of case definitions of sepsis used with administrative data.
Thus, there is a need for studies using more stringent methodological approaches to estimate the validity of case register diagnoses.
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Finally, we note that our validation study sample included too few patients with depression to reliably test the validity of case-finding questions about this disorder.
Robin Steinberg, the executive director of the Bronx Defenders, a nonprofit legal organization that represents the poor, said she believed that Mr. Johnson's office was doing a good job of assessing the validity of cases before bringing them to trial.
The validity of cases (ii) and (iii) follow that of case (i).
Correct control selection is crucial to the internal validity of case-control studies.
Correct control selection is crucial to the internal validity of case-control studies [ 1, 2].
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