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Review Question - QID 7159

Clinical Trial Design QID: 7159 (SAE10BS.71)
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QID 7159 (Type "7159" in App Search)
A study is proposed in which 50 patients with osteonecrosis of the knee are compared with 23 patients without osteonecrosis in terms of their alcohol consumption levels. This is an example of what type of study?
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