MINNEAPOLIS, April 24, 2019 (GLOBE NEWSWIRE) — Relievant Medsystems, a privately-held medical device company developing minimally-invasive solutions for chronic low back pain (CLBP), today announced the publication of 24-month results from the SMART trial in the International Journal of Spine Surgery. A total of 106 of the 128 treatment arm patients in the SMART trial completed …