While I was living in Brazil ( in the 50's and 60's) that was a given: all those gifts and money -  there are many ways of giving money under and over the rug -  by Big Pharma to doctors and students of medicine. Two relatives of mine just fresh out of medical school boasted to this one here that they were earning money so fast ...They bought the most expensive houses in town on their first year of practice!  Amazing. Thankfully Canada is different ...