RT Journal Article SR Electronic T1 Europe unveils risk assessment guidance for engineered nanomaterials used in food chain JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E774 OP E774 DO 10.1503/cmaj.109-3939 VO 183 IS 12 A1 Tiago Villanueva YR 2011 UL http://www.cmaj.ca/content/183/12/E774.abstract