You don't just want to say that you're an expert or have a lot of experience, but you can be a little bold here by stating that, although you find it very impressive here, you have noticed that there are some gaps in the total picture of care rendered, and you feel you can fill these gaps. This is a way of saying that selecting you will not only fill a position, but even add value. You can further state that you can bring additional resources that most hospitals don't have, which would make this organization stand out above the rest. (These are the offerings that will make you particularly attractive, where you tout your special interests; special interests are specific aspects of one's specialization that do not have the bureaucratic designation of certification by a board. For example, you may be board certified or board eligible in OBGYN, or even further (for example, in reproductive endocrinology), but you might say you have a special interest in gestational diabetes. This would sound very fortuitous to a hospital struggling with an unacceptable neonatal morbidity due to the percentage of large-for-gestational age babies in its demographic.