The longer that unproven therapies stay on the market, the greater is the risk that a history of use can be framed as evidence of safety and efficacy.
未经检验的干细胞疗法在市场上停留的时间越长，那些使用历史被做为其安全性和有效性的证明的风险就越大。
An interim landmark would be to develop and license a first-generation vaccine by 2015 with 50% protective efficacy against severe disease and death that would last longer than one year.
一项暂定目标是到2015年之前将研制和许可使用第一代具有一年以上50%预防功效的疫苗，可预防严重疾病和死亡。
Larger and longer trials are needed to evaluate the clinical efficacy and safety of this approach.
但还需要更加大规模和更长期的实验研究来评估这种方法的临床疗效和安全性。
Greater sample sizes and a longer follow-up period are required to fully determine the long-term safety and efficacy of this minimally invasive surgical technique.
需要更大样本的研究、更长时间的随访来明确小切口手术技术的远期疗效和安全性。
Compared with the manic group, the mixed group showed its higher misdiagnosis rate, longer time of admission and poorer efficacy.
混合组具有易被误诊、住院时间长、疗效较差的特点。
Conclusion Compared with PPH, STARR has a better long-term efficacy although its fee is higher and surgery time is longer.
结论与PPH术相比，STARR术治疗直肠前突虽然在手术住院费用和手术时间上有所增加，但远期疗效较好。
We aimed to assess efficacy with regards to longer-term outcomes, quality of life, and health economic outcomes.
我们的目的是评估疗效方面长期的成果，提高生活质量和健康的经济成果。
But its long efficacy needs more cases, more evaluation index and longer time follow-up to prove.
但其远期效果仍需更多病例、更全面的评价指标和更长时间的随访研究。
But its long efficacy needs more cases, more evaluation index and longer time follow-up to prove.
但其远期效果仍需更多病例、更全面的评价指标和更长时间的随访研究。
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