Anchoring

Do you use any technique to moderate/eliminate the impact/influence of anchoring (providing a reference value) during your risk workshops?  I just became aware of the phenomenon(a) and wondered what others are doing.  Generally, I try to elicit percentage ranges eg. -10%, +20% to the calculated/estimated deterministic value.  In my mind, that should be enough.  Is it?  What do you do?

Thanks,