Adverse results, including strokes and deaths, are rare. The safety of manipulation, particularly on the cervical spine has been debated. There is no evidence that chiropractic spinal adjustments are effective for any medical condition, with the possible exception of treatment for lower back pain. Chiropractors use their version of spinal manipulation (known as chiropractic adjustment) as their primary treatment method, with non-chiropractic use of spinal manipulation gaining more study and attention in mainstream medicine in the 1980s.