Efficacy and Safety of Cannabidiol Followed by an Open Label Add-On of Tetrahydrocannabinol for the Treatment of Chronic Pain in Patients With Rheumatoid Arthritis or Ankylosing Spondylitis: Protocol for a Multicentre, Randomised, Placebo-Controlled Study

BMJ Open - United Kingdom
doi 10.1136/bmjopen-2018-028197