NCCHTA, UK
The BMJ Editors and the International Committee of Medical Journal
Editors define competing interests as including: financial relationships with industry (for example through employment, consultancies, stock, ownership, honoraria, and expert testimony), either directly or through immediate family; personal relationships; academic competition; and intellectual passion.
Source: BMJ Editors (http://bmj.bmjjournals.com/advice/editorial_policies.shtml#competing) and the International Committee of Medical Journal Editors (http://www.icmje.org/index.html#conflict).