@book{3054,
	author = {Rothman, Kenneth J. and Greenland, Sander.},
	title = {Modern epidemiology /},
	publisher = {Wolters Kluwer Health/Lippincott Williams & Wilkins,},
	year = {c2008.},
	address = {Philadelphia:},
	edition = {3rd ed.},
	note = {Includes bibliographical references (p. 683-732) and index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0743/2007036316-d.html}
}