@book{38105,
	author = {Margetts, Barrie M.},
	title = {Design concepts in nutritional epidemiology},
	publisher = {Oxford University Press,},
	year = {1997.},
	address = {Oxford :},
	edition = {2nd ed.},
	note = {Previous ed.: 1991.},
	url = {http://dx.doi.org/10.1093/acprof:oso/9780192627391.001.0001}
}