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The rating system
How useful are different treatments?
These treatments are very useful. They are strongly supported as effective by scientific evidence.
These treatments are useful. They are supported by scientific evidence as effective, but the evidence is not as strong.
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.
On the available evidence, these treatments do not seem to be effective.
These treatments have not been properly researched. It is not possible to say whether they are useful or not.
Safety or other concerns have been raised for the use of these treatments.
