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What this site is An information publication. Everything here is general information, not medical or legal advice, and no substitute for a clinician or a poisons centre. Nothing on this site can assess a person. Reuse Text is licensed CC BY-NC 4.0. Photographs are not: they are licensed to us and not available for reuse. […]
Last reviewed 21 August 2026.
An information publication. Everything here is general information, not medical or legal advice, and no substitute for a clinician or a poisons centre. Nothing on this site can assess a person.
Text is licensed CC BY-NC 4.0. Photographs are not: they are licensed to us and not available for reuse. Reprint enquiries go through the contact page.
If something here is wrong, tell us. We check it against the source and log the correction with a date.
Accessibility problems and factual errors in this document are treated the same way as errors in an article: reported, checked, and logged with a date.