Encara no tenim significats per a "valid criterion".
1Immunohistochemical demonstration of calcitonin is apparently the only valid criterion for a differential diagnosis.
2It is, therefore, a valid criterion for discrimination.
3Conclusion: Simple presence of the specialized columnar epithelium is not a valid criterion for a diagnosis of Barrett's esophagus.
4A star-drive could only be developed with a far-reaching understanding of the physical sciences, so this is a valid criterion of intelligence.
5All three are valid criteria and we hope we can address all three.
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