

@article {7312,
	title = {Epidemiology in practice: case-control studies},
	journal = {Community Eye Health},
	volume = {11},
	number = {28},
	year = {1998},
	pages = {57{\textendash}58},
	url = {http://www.cehjournal.org/wp-content/uploads/download/ceh_11_28_057.pdf},
	author = {Lewallen, Susan and Courtright, Paul}
}
