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Quality Control in Clinical Trials

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3. Less often but more concern<strong>in</strong>g are<br />

systematic differences <strong>in</strong> measurement<br />

techniques associated with participant<br />

characteristics: obese or unfit<br />

persons allowed to hold hand rails <strong>in</strong><br />

exercise test<strong>in</strong>g; persons with<br />

emphysema permitted to shorten<br />

exhalation time <strong>in</strong> spirometry test<strong>in</strong>g

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