Efficacy and Safety Study of BIIB074 in Participants With Small Fibre NeuropathyThe purpose of this study is to evaluate the efficacy of BIIB074 in treating pain experienced by participants with confirmed small fibre neuropathy (SFN) that is idiopathic or associated with diabetes mellitus. Recruiting Principal Investigator Kristine ChapmanBody Locations and Systems Diabetes - Type 1, Diabetes - Type 2, Diabetic Nerve ProblemsArea VancouverAge 18 and above