Dempster, B. Clinical research report: a multi centre randomised, double blind, placebo managed, parallel team comparison of the consequences of cannabis centered drugs standardised extracts more than 4 months, in patients with Persistent refractory ache resulting from various sclerosis or other defects of neurological functionality. GW Pharma Ltd Study Code: https://www.saho.cz/legalni-prodej-i-pestovani-konopi/