There are numerous articles showing that hypnosis is an effective treatment for lots of difficulties and psychological conditions. Below are a few which have been published in reputable journals, and have been peer reviewed. Click the link to read the paper online or (due to copyright law), where you may purchase the book on Amazon.
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Brown D. (2007) Evidence based hypnotherapy for asthma: A critical review. International journal of clinical & experimental hypnosis. 55 220-249.