Balanced placebo experimental

The better-designed studies included double blind, placebo-control conditions within a parallel research design. However, most studies did not provide any data on how they randomized or counter-balanced their experimental and placebo or control groups. No studies explicated how they were able to match the two groups in terms of the severity or duration of the subjects anxiety states. Future studies should use a more robust research methodology, such as a double blind, placebo-controlled, cross over design. 

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