Like you don't know what you don't know.

Exactly.

And that is part of the problem.

A pediatric rheumatologist will pick up juvenile arthritis quite quickly, but the signs and symptoms are sort of nonspecific.

Everybody gets aches and pains from time to time.

The classic is, my daughter's got growing pains or something else or they've injured themselves.

But these kiddies with arthritis, their symptoms persist.

And in that cataract example, would that be treated, if you like, the same as a cataract in a 60, 70, 80-year-old?