This practice of doctors receiving incentives from medical companies is fairly new to my country, as such a thing was impossible during the communist era. And it took us a while to figure out the scale of this corruption system. Back when my now teenage daughter was a baby and we went to see the doctor I used to be so impressed by the colorful posters advertising new drugs. They gave out a sense of certainty - this doctor is up to date with the best new drugs available. Of course, she was also up to date with the newest vaccines, better than the ones provided by our public health system. Sure, the fancy one costs like $50, but what kind of parent wouldn't pay a mere fifty dollars for the child's health... and she so happened to have some vials stored in the fridge...
Many people are as naive as I once was which is why getting the message across by whatever means is so important!.