I have a question concerning objective outcomes. Please note I don't mean to not use objective outcomes. How would you measure cognitive function objectively? E.g. my cognitive function improved, but physical function seems to be unchanged. Personally, I value a better cognitive function very much (although I would be glad everything would be ok) - would it be much better I could probably start working again - so I wouldn't say it's a worthless parameter. But how to measure such parameters objectively? Did the PACE authors look at cognitive function, and how did they measure it?