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.
Lehmann K, Radbruch L, Gockel HH, Neighbors D, Nuyts G. Costs of opioid therapy for chronic nonmalignant pain in Germany: an economic model comparing transdermal fentanyl (Duragesic) with controlled release morphine. Eur J Health Econ. 2002;3:111-9. doi: 10.1007/s10198-002-0097-6.