@book{6209,
	author = {Rothman, Kenneth J.},
	title = {Epidemiology :},
	publisher = {Oxford University Press,},
	year = {2002.},
	address = {New York, N.Y. :},
	url = {http://www.loc.gov/catdir/enhancements/fy0612/2001036737-t.html}
}