The other 2015 review was a narrative literature review was more tentative, noting the long safety record but only willing to state that the procedure "may be effective in reducing symptom burden and quality of life scores up to 8 years post-intervention.
The 2015 review, a narrative literature review, acknowledged the safety record but only suggested that the procedure might be effective in reducing symptom burden and improving quality of life scores up to eight years post-intervention.