Merge pull request #4466 from opensafely-core/iaindillingham/study-pu…

…rpose-help-text

Update study purpose help text

snippets/study_purpose-help_text.md

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 Briefly describe the aims, potential methods and the expected outputs (for example, peer-reviewed paper, policy white paper, blog, etc).
 
 If your study has a research and service evaluation/audit component, please describe each part separately under a research heading and a service/evaluation heading in this box.
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+**If you are planning to conduct analyses to produce a risk prediction model to implement in clinical practice, you MUST also detail this in your Study Information section (explaining the methods to be used, the intended benefits, risks of methods and how you intend to mitigate these risks) so that NHS England and others can consider any regulatory or liability issues.**