text_1: 在 研究者 最初 报告 的 呼吸机 相关 性肺炎 病例 中 , 有 1 / 4 在 随后 的 裁定 中未 得到 确认 .
  
text_2: one fourth of the cases of ventilator @-@ associated pneumonia that were initially reported by investigators were not subsequently confirmed during adjudication .
  