三个浓度水平
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three concentration levels
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Methods Serum calcium and intact PTH levels in twenty-three HD patients were observed when their dialysate calcium concentration was adjusted.
目的了解调整透析液钙浓度对血液透析患者血钙和甲状旁腺激素（PTH）的影响。
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