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None of the existing instruments was validated more than once.
However, only one of the bladder cancer disease specific instruments was validated in previous studies (FACT-Bl).
Accurate performance and comparability of both instruments was validated with NIST-traceable (National Institute of Standards and Technology, USA) reference particles.
Similar(57)
The instrument was validated through face validity, content validity and inter-rater reliability.
The instruments were validated on 94 primary total knees.
Although these instruments were validated in primary care patients, their usefulness in patients with migraine is unknown.
Regardless of instrument used, it is essential that instruments be validated against each other so that their usefulness may be assessed.
The instruments are validated [ 37].
The instruments were validated and standardised.
Most of the instruments were validated.
The three instruments were validated compared to actometers.
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