Greiner W, Lehmann K, Earnshaw S, Bug C, Sabatowski R. Economic evaluation of Durogesic in moderate to severe, nonmalignant, chronic pain in Germany. Eur J Health Econ. 2006 Dec 1;7(4):290-6.
Earnshaw SR, Richter A, Sorensen SW, Hoerger TJ, Hicks KA, Engelgau M, Thompson T, Narayan KMV, Williamson DE, Gregg E, Zhang P. Optimal allocation of resources across four interventions for type 2 diabetes. Med Decis Making. 2002 Jan 1;22(5):S80-91.