Relationships between biomedical companies and guideline makers are often undisclosed

Financial relationships between organisations that produce clinical guidelines and biomedical companies are common and often not disclosed in the guidelines, according to research published in PLOS Medicine.1

The Canadian researchers conducted a cross sectional survey and a website review of 290 clinical practice guidelines produced by 95 national or international medical organisations.

All the guidelines were published in 2012 on the National Guideline Clearinghouse …