Exclusion criteria included the use of any PD medication within @ days , the use of any symptomatic PD medication for more than @ days , atypical or drug-induced parkinsonism , a Unified Parkinson 's Disease Rating Scale ( UPDRS ) rest tremor score of @ or greater for any limb , a Mini-Mental State Examination score of @ or less , a history of stroke , the use of certain supplements , and substantial recent exposure to CoQ@ .