@book{208736,
	author = {Hulley, Stephen B.},
	title = {Designing clinical research},
	publisher = {Lippincott Williams & Wilkins},
	year = {c2007.},
	address = {Philadelphia, PA},
	edition = {3rd ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0619/2006028271.html}
}