Ron,

I think we can just write to researchers. I know a few that I could probably get an answer from. It's a very valid question, which could cause them to respond. I can ask Tom Isaacs to ask Steve Gill. We could write in to Ask the Doctor. Just some thoughts.

Edited to add: if everyone would ask their neuro the next time they go that would probably yield some real interesting replies and be fun as well.

Edited again to say I can't believe how my idea of "fun" has changed.

Paula