Sometimes these medical authors are considered “ghostwriters,” or paid writers who write a communicative piece but are not formally acknowledged as a text's author. Karen L. Wooley says that professional writers must adhere to ethical guidelines that ghostwriters may not be expected to follow. While authors control their content when working with a professional medical writer, Wooley says that ghostwriters may try to take control of the content away from the author and hide certain facts, such as where a project's funding comes from.[43] Researchers such as Elliott Moffatt are concerned that medical ghostwriting, especially in the context of pharmaceutical research, is dangerous to public health.[44] Possible dangers can include misrepresenting the data and subtly influencing the way clinicians and patients perceive the data.