Risk assessment of insect-resistant and herbicide-tolerant genetically modified maize Bt11 for cultivation import, processing, food and feed uses under Directive 2001/18/EC (C/F/96.05.10) and Regulation (EC) No 1829/2003 (EFSA/GMO/RX/Bt11). Opinion of the Panel on Genetically Modified Organisms of the Norwegian Scientific Committee for Food Safety. VKM Report:22