Several studies have evaluated the various modalities for DVT prophylaxis, and comparison studies have stratified the risks and benefits for each option.
已经有研究对各种不同DVT预防方案作了评估，并有对比研究将每种方法的收益与风险作了分层分析。
Several studies have evaluated the various modalities for DVT prophylaxis, and comparison studies have stratified the risks and benefits for each option.
已经有研究对各种不同DVT预防方案作了评估，并有对比研究将每种方法的收益与风险作了分层分析。
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