The 250 number refers to the medical field. So the requisite background includes at least biology, and more preferably clinical experience. That diminishes the

The 250 number refers to the medical field. So the requisite background includes at least biology, and more preferably clinical experience. That diminishes the pool somewhat. A similar phenomena certainly manifests in other highly specialized fields though. There are far fewer people with both the skills we're talking about, and deep water E&P or big 3 audit experience, for instance.