Study limitations include small number of patients, lack of randomization, possible learning effect related to the protocol beginning with LFO, and inability to determine the effect of HFO.

 
  • 该项试验限制,包括病患样本数不足、没有随机分派、与先使用LFO有关可能的学习效应、以及无法决定HFO的效果。
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