Published August 5, 2015 BMC Neurology
Dr George Jelinek's study: "Latitude, sun exposure and vitamin D supplementation: associations with quality of life and disease outcomes in a large international cohort of people with multiple sclerosis"
http://www.biomedcentral.com/1471-2377/15/132

A growing evidence base implicates vitamin D, sun exposure and latitude in the aetiology of multiple sclerosis (MS), however there are less data on the associations of these variables with disease outcomes.