It would be unpractical to search for individual doctors, nurses and other medical stuff and then present them with your offers, but the email makes it virtually unnecessary. A lot of emphasis has been placed on making the system highly interactive, and the healthcare mailing lists are used as a vehicle to meet prospective clients halfway. It is not intended as a method to harass anyone or to trick them into doing something they do not want, quite the opposite.
The premise is that the medical personnel is interested in this kind of services and instruments, which are going to make their lives better and help them treat more patients. This is why if used wisely and with complete respect to ethics, the healthcare mailing lists are going to deliver the best results, in the long run. Fortunately, there is no risk for these healthcare mailing lists to lose their validity as the companies offering them will make sure that they are always accurate.