Garcia-Albeniz X, Logan RW, Schrag D, Hernan MA. Evaluation of the duplication of staging CT scans for localized colon cancer in a Medicare population. Med Care. 2014 Nov;52(11):963-8. doi: 10.1097/MLR.0000000000000231
Ferrer P, Ballarín E, Sabate M, Laporte JR, Schoonen M, Rottenkolber M, Fortuny J, Hasford J, Tatt I, Ibanez L. Sources of European drug consumption data at a country level. Int J Public Health. 2014 Oct;59(5):877-87. doi: 10.1007/s00038-014-0564-8