@book{222941,
	author = {K�all�en, Anders. and ebrary, Inc.},
	title = {Understanding biostatistics},
	publisher = {John Wiley & Sons Inc.,},
	year = {2011.},
	series = {Statistics in practice},
	address = {Chichester, West Sussex, United Kingdom :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10510403}
}