这使得它们感染慢性毒素的可能性大大增加。
This makes them potentially more susceptible to chronic toxic exposure.
这些因素可能混淆肉毒素对慢性紧张型头痛的特别效果。
These factors may have confounded the specific efficacy of botulinum toxin for chronic tension-type headache.
最后，选择的人可能不是作为肉毒素治疗的最佳慢性紧张型头痛的患者。
Finally, the patient population selected may not have been optimal for a trial of botulinum toxin for chronic tension-type headache.
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