L. Z. Shi,M. Hodges,M. Drummond,J. Ahn,S. C. Li,S. L. Hu,F. Augustovski,J. W. Hay and J. Smeeding. Good Research Practices for Measuring Drug Costs in Cost-Effectiveness Analyses: An International Perspective: The ISPOR Drug Cost Task Force Report-Part VI. Value in Health. 2010;13(1):10.1111/j.1524-4733.2009.00662.x.