Some will be the sort of folks who insist on using the latest and greatest. Others will represent large purchasers, searching for something that might work on patients who haven’t responded to other methods.
It requires a certain personality type – patient, reassuring, unpressuring – to engender trust and establish this sort of relationship in a business context.
Picture a boat with two holes in its bottom. Fix one and not the other and the second leaks a little worse than before.