| 21. | The disease has a similar etiology to Hirschsprung's disease in humans.
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| 22. | Nevertheless, it appears to be a real clinical entity of unknown etiology.
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| 23. | Underlying etiology is the other significant determinant of outcome.
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| 24. | The etiology of autism may include excessive glutamatergic mechanisms.
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| 25. | There is no recognized etiology for infantilism and little research on the subject.
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| 26. | This category of TMA encompasses all forms that do not have obvious etiologies.
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| 27. | The family environment and psychodynamics in the etiology of psychosis comes under scrutiny.
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| 28. | The diagnosis is controversial, and its etiology is still not fully understood.
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| 29. | Neurocutaneous conditions are due organic nervous system disease or are psychiatric in etiology.
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| 30. | This is known because in some special cases the etiology can be identified.
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