severity of chronic periodontitis
...慢性重度牙周炎 chronic severe periodontitis ; chronic Severe periodontitis ; patients with severe chronic periodontitis ; severity of chronic periodontitis 牙周炎动物模型 animal model of periodontitis ; periodontitis animal model ; experimental periondontitis model ..
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severity of chronic periodontitis
慢性牙周炎的严重程度
以上为机器翻译结果，长、整句建议使用 人工翻译 。