Nerve root block versus surgery (NERVES) for the treatment of radicular pain secondary to a prolapsed intervertebral disc herniation: study protocol for a multi-centre randomised c... oleh Martin J. Wilby, Carolyn Hopkins, Emma Bedson, Sue Howlin, Girvan Burnside, Elizabeth J. Conroy, Dyfrig A. Hughes, Manohar Sharma, Anthony Marson, Simon R. Clark, Paula Williamson