Patients with DN are not presented with typical clinical manifestations at the early stage, making it difficult for early diagnosis.
DN早期常缺乏特异的临床表现，早期诊断有一定困难。
Patients with DN are not presented with typical clinical manifestations at the early stage, making it difficult for early diagnosis.
DN早期常缺乏特异的临床表现，早期诊断有一定困难。
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