<ArticleBackmatter>
<Heading>Ethical standards and patient consent</Heading>
<Heading>Ethical standards and patient</Heading>
<Heading>standards and patient consent</Heading>
</ArticleBackmatter>
我想在 Heading 节点中获取从 "Ethical" 开始、包含 "and" 并以 "consent" 结尾的内部文本。