In 2015, a systematic review to assess the effectiveness of cannabis
extracts and cannabinoids in the management of chronic nonmalignant
neuropathic pain.

Background: Electronic database searches were performed
using Medline, PubMed, Embase, all evidence-based medicine reviews, and
Web of Science, by searching, printed indices from 1950.

You can read the full article here => http://goo.gl/n2nMnn