@book{12550,
	author = {Petrie, Aviva and Sabin, Caroline},
	title = {Medical statistics at a glance },
	publisher = {Wiley-Blackwell},
	year = {2009},
	series = {At a glance series},
	address = {Chichester, UK },
	edition = {3rd ed.},
	note = {Includes index.}
}