So, in fact, this double blind placebo controlled study does not guarantee safety or efficacy because the test leaves far too many questions unanswered.
所以实际上，双盲对照研究并不会保证疗效和安全，因为它留下太多无法回答的问题。
DESIGN: a randomized grouping comparison and placebo controlled study.
设计：随机对比观察，安慰剂对照。
Leflunomide was evaluated in a randomized, double-blind, placebo-controlled study in active ankylosing spondylitis but was not found to be effective.
来氟米特通过随机双盲安慰剂对照试验研究表明，对强直性脊柱炎急性期没有效果。
Efficacy and Safety of Prophylactic Large Dose of Tranexamic Acid in Spine Surgery: a Prospective, Randomized, Double-Blind, Placebo-Controlled Study.
预防性大剂量氨甲环酸在脊柱外科中的疗效和安全性：一个前瞻性，随机，双盲，安慰剂对照的研究。
The Myoblast Autologous Grafting in Ischemic Cardiomyopathy (MAGIC) trial: first randomized placebo-controlled study of myoblast transplantation.
肌病（MAGIC）试验：成肌细胞移植的第一个安慰剂-对照试验。
The double-blind, randomized, placebo-controlled study included 24 patients ages 48 to 84.
该双盲随机严格对照试验纳入了24名48到84岁的患者。
The double-blind, randomized, placebo-controlled study included 24 patients ages 48 to 84.
该双盲随机严格对照试验纳入了24名48到84岁的患者。
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