 - Participants taking anticonvulsants, and other psychotropic medication see exceptions below that cannot be safely tapered and discontinued. The following psychotropic medications are allowed: i any antidepressant; ii zopiclone, trazadone, or a benzodiazepine if they have been taken at a stable dose for at least 4 weeks prior to study entry and; iii gabapentin and pregabalin if they have been taken at a stable dose for at least 4 weeks prior to study entry AND if prescribed for chronic pain. 