... when a drug company conjures up the concept for an article that will counteract criticism of a drug or embellish its benefits, hires a professional writing company to draft a manuscript conveying the company's message, retains a physician to sign off as the author, and finds a publisher to unwittingly publish the work.
As a researcher this type of thing amazes me.
Update: A new article with some added detail. To give you an idea of the scope:
In 1997, for example, DesignWrite, a medical communications company in Princeton, N.J., proposed to Wyeth a two-year plan that would include the preparation of about 30 articles for publication in medical journals.