The Vancouver guidelines (ICMJE)
The Vancouver authorship guidelines − the "uniform requirements" − were prepared by The International Committee of Medical Journal Editors, "The Vancouver Group" (ICMJE) and have since been adopted by 600 medical journals.
The rules define authorship and outline clear criteria for co-authorship to be fulfilled by every individual author.
The Vancouver authorship guidelines also include other recommendations, for instance regarding the declaration of conflict of interest.