@book{204217,
	author = {Porta, Miquel S. and International Epidemiological Association.},
	title = {A dictionary of epidemiology},
	publisher = {Oxford University Press,},
	year = {2008.},
	address = {Oxford ;},
	edition = {5th ed. /},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10375136}
}