@book{31589,
	author = {Fletcher, Robert H. and Fletcher, Suzanne W.},
	title = {Clinical epidemiology},
	publisher = {Lippincott Williams & Wilkins,},
	year = {2014},
	address = {Philadelphia :},
	edition = {5th edition},
	url = {http://192.168.201.76/multim/m10154/cover10154.jpg}
}