@article{jacoby_is_2014,
	title = {Is it necessary to adjust for calendar time in a test negative design?: {Responding} to: {Jackson} {ML}, {Nelson} {JC}. {The} test negative design for estimating influenza vaccine effectiveness. {Vaccine} 2013;31({April} (17)):2165–8},
	volume = {32},
	issn = {0264-410X},
	shorttitle = {Is it necessary to adjust for calendar time in a test negative design?},
	url = {http://www.sciencedirect.com/science/article/pii/S0264410X1301150X},
	doi = {10.1016/j.vaccine.2013.08.048},
	number = {25},
	urldate = {2015-03-19},
	journal = {Vaccine},
	author = {Jacoby, Peter and Kelly, Heath},
	month = may,
	year = {2014},
	pages = {2942},
}

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