In: Report of the fourth session of the Codex ad hoc Intergovernmental Task Force on Antimicrobial Resistance, Muju, Republic of Korea, 18–22 October 2010. Rome, Codex Alimentarius Commission, 2010 (http://www.codexalimentarius.net/download/report/746/REP11_AMe.pdf , accessed 20 January 2011): 25–49. The medical impact of the use of antimicrobials in food animals: report of a WHO meeting, Berlin, Germany, 13–17 October 1997. Geneva, World Health Organization, 1997 (http://whqlibdoc.who.int/hq/1997/WHO_EMC_ZOO_97.4.pdf , accessed 20 January 2011).