In the world of medicine, "key opinion leader" is the somewhat Orwellian term used to describe the senior doctors who help drug companies sell drugs. : BMJ : British Medical Journal
Ethical Considerations in the Interpretation and Communication of Clinical Trial Results -- Coultas 4 (2): 194 -- Proceedings of the American Thoracic Society
The frequency with which scientists fabricate and falsify data, or commit other forms of scientific misconduct is a matter of controversy... Misconduct was reported more frequently by medical/pharmacological researchers than others...This metareview is a conservative estimate of the true prevalence of scientific misconduct.