@article {ascherio2013vitamin,
	title = {Vitamin D as a predictor of multiple sclerosis activity and progression.},
	year = {2013},
	author = {Ascherio, A and Munger, K and White, R and Kochert, K and Simon, C and Polman, C and Freedman, MS and Hartung, HP and Miller, DH and Montalban, X and others}
}
