I cannot create a summary of this article because the medical article by Helen Salisbury titled "The use and misuse of fit notes" is not found in the search results provided. The search results contain only subject information sheets from the University of Pavel Jozef Šafárik and other materials that are not relevant to your query. In order to create an accurate and factual summary as per your requirements, I need access to Helen Salisbury's own article on fit notes.