The passage is correct without the articles you put in - even if this definition and this treatment have been previously mentioned. To explain this is difficult - this is one of the myriad situations in English where article use is seemingly not according to textbook rules. Putting in the articles make the passage incomprehensible.
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Anonymous"The comparative incidence of psychiatric injury in between the two conflicts cannot be known, for both the definition and the treatment changed radically over those years."Why did the author omit the definite article in this sentence? I added them there myself.Could someone help me and answer my question please?