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2. Clinical Laboratory Improvement Amendments of 1988; Final Rule. Federal Register. 1992; 57: 493.1257.
3. Clinical Laboratory Improvement Amendments of 1988; Final Rule. Federal Register. 1992; 57: 493.1257(b).
4. Clinical Laboratory Improvement Amendments of 1988; Final Rule. Federal Register. 1992; 57: 493.1257(d)(3).
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