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<ArticleBackmatter>
   <Heading>Ethical standards and patient consent</Heading>
   <Heading>Ethical standards and patient</Heading>
   <Heading>standards and patient consent</Heading>
</ArticleBackmatter>

我希望从"道德"开始获取内部文本,包含"和",并在标题节点中以"同意"结束.