I use an example from my own research: Horton, S. and J. Ross, The economics of iron deficiency.  Food Policy 28:51-75, 2003 (see also Horton, S. and J. Ross Corrigendum.  Food Policy 32:141-143, 2007); and subsequent policy applications Horton, S., H. Alderman and J. Rivera.  Copenhagen Consensus 2008 Challenge Paper: Hunger and Malnutrition.  Available at http://www.copenhagenconsensus.com/Default.aspx?ID=1322.  Horton, S., M. Shekar, C. McDonald, A. Mahal, J.K. Brooks.  Scaling up nutrition: what will it cost?  Washington DC: World Bank, 2010.