How much does pharmaceutical industry control what appears in medical literature?

Ghosts, drugs, and blogs:

By its hidden nature, it is obviously a challenge to determine the exact prevalence of “ghost management,” defined by Sismondo as the phenomenon in which “pharmaceutical companies and their agents control or shape multiple steps in the research, analysis, writing, and publication of articles.”

Of course they fight against Open Access Publishing – too much sunshine scares them and would make them scurry away in panic…