@article {Shirani2014,
	title = {Investigation of heterogeneity in the association between interferon beta and disability progression in multiple sclerosis: an observational study},
	journal = {European Journal of Neurology},
	volume = {21},
	number = {6},
	year = {2014},
	pages = {835{\textendash}844},
	publisher = {Wiley Online Library},
	doi = {10.1111/ene.12324},
	author = {Shirani, A and Zhao, Y and Karim, ME and Petkau, J and Gustafson, P and Evans, C and Kingwell, E and Kop, ML and Oger, J and Tremlett, H}
}
