Longest time on a successful treatment for psoriasis

[Fred]

I think it is only possible in some kind of double poll. Some where you can mention the treatment and the number of years on it. Kind of a matrix.

Mmmmmmmmmmmmmm it would be a very big poll to include All treatments.

Though Jim has a point too this poll isn't of much use really as the amount of years can go up.

You should have to have a "start" date and than calculate the time.
But I fear that requires programming that is not part of the forum.

Yes all getting a bit complex now.