此阶段的研究设计可以根据具体的研究目的，采用多种形式，包括随机盲法对照临床试验。

Various forms may be employed for the study design of this phase in accordance with the specific study purpose, including randomized controlled clinical trial.

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研究设计和方法对于患有慢性足部溃疡的糖尿病患者，超高压氧气疗法（HODFU）研究采用了随机分组、单中心、双盲、安慰剂对照的临床试验。

RESEARCH DESIGN AND METHODS The Hyperbaric Oxygen Therapy in Diabetics with Chronic Foot Ulcers (HODFU) study was a randomized, single-center, double-blinded, placebo-controlled clinical trial.

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