By accepting SWAG from the pharma rep, or accepting free trips to conferences sponsored by pharama. If a doctor has not heard about a new drug the their reps just haven't made their way to them yet because they're in a smaller market. The yet is key, eventually a rep will make their way to them. More than likely much sooner than the TV ads run

By researching new drugs? Though sadly at the moment the doctor is also a target of advertising. The point being that this should generally be a pull process driven by a demand (and mediated by neutral review and publication processes) and not a push being driven by a supply (mediated by a process that goes to the highest bidder).

so in your mind "advertisement" covers any transmission of information?