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These treatments are very useful.
They are strongly supported as effective by scientific evidence. |
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These treatments are useful.
They are supported by scientific evidence as effective, but the evidence is not as strong. |
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These treatments are promising and may be useful. They have some evidence to support them, but more evidence is needed to be sure they work. |
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On the available evidence, these treatments do not seem to be effective. |
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These treatments have not been properly researched. It is not possible to say whether they are useful or not. |
How useful are treatments?