@article {karim2014marginal,
	title = {Marginal Structural Cox Models for Estimating the Association Between β-Interferon Exposure and Disease Progression in a Multiple Sclerosis Cohort},
	journal = {American journal of epidemiology},
	volume = {180},
	number = {2},
	year = {2014},
	pages = {160{\textendash}171},
	publisher = {Oxford University Press},
	doi = {10.1093/aje/kwu125},
	author = {Karim, Mohammad Ehsanul and Gustafson, Paul and Petkau, John and Zhao, Yinshan and Shirani, Afsaneh and Kingwell, Elaine and Evans, Charity and van der Kop, Mia and Oger, Joel and Tremlett, Helen}
}
