Methods A study of randomized double-blind contrast test was performed with piracetam as contrast medicine.
方法 采用随机双盲对照试验，对照药物为吡拉西
。
Methods A study of randomized double-blind contrast test was performed with piracetam as contrast medicine.
方法 采用随机双盲对照试验，对照药物为吡拉西。
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