@book{5509,
	author = {Sackett, David L., },
	title = {Clinical epidemiology : },
	publisher = {Little, Brown, },
	year = {c1991.},
	address = {Boston : },
	edition = {2nd ed.},
	note = {Rev. ed. of: Clinical epidemiology / David L. Sackett, R. Brian Haynes, Peter Tugwell. 1st ed. c1985.}
}