@book{178190,
	author = {Sackett, David L.},
	title = {Epidemiología clínica},
	publisher = {Editorial Médica Panamericana},
	year = {(c) 1994, 1998.},
	address = {México, D.F.},
	edition = {2da ed., 3ra reimpr.},
	note = {Five Critical appraisal cards in pocket.}
}