@book{206146,
	author = {Campbell, Michael J., and Walters, Stephen John,},
	title = {How to design, analyse and report cluster randomised trials in medicine and health related research /},
	publisher = {Wiley,},
	year = {2014.},
	series = {Statistics in Practice},
	address = {Chichester, England :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10856835}
}