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简述自身前后对照试验的优缺点。
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【单选题】However, there was potential bias in the included studies, so the conclusion still needed further high quality（ ）(随机对照试验）to improve the evidence level.
A.
randomized treated trials
B.
randomized controlled trials
C.
randomized controlled examination
D.
randomly controlled trials
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【单选题】However, there was potential bias in the included studies, so the conclusion still needed further high quality（ ）(随机对照试验）to improve the evidence level.
A.
randomized treated trials
B.
randomized controlled trials
C.
randomized controlled examination
D.
randomly controlled trials
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