Study reports lack of specificity in CoI guidelines
Sheldon Krimsky & Erin Sweet from Tufts University, Massachusetts, USA have studied the conflict of interest (CoI) policies of over 200 medical and toxicology journals. They found that about 85% of the journals had a written CoI policy but in many cases these lacked specificity or were of limited scope (eg covering only certain types of financial interest).
See Accountability in Research 2009;16:235-53
The article is not Open Access but the abstract is available on Medline.