You shouldn't answer this question with how you're an expert and have a lot of experience. But you do want to pat yourself on the back a little; saying that while you find the practice here impressive, you've noticed some areas in which you could improve the breadth and depth of care. This is like saying that you can not only give this hospital or group what's needed, but even go beyond that. You should find a way to add that you offer additional resources that other places don't have, which would make this place stand out from a marketing standpoint. (This is where you can tout your special interests.) For example, while you may be boarded in Endocrinology, or even further trained (for example, in Pediatric Endocrinology), you might say your special interest is in Type 1 diabetes.