From "Diffusion of Laparoscopic Cholecystectomy in the Veterans Affairs Health Care System, 1991-1995" Effective Clinical Practice, March/April 1999. 2:49-55.
Figure 3. Increase in cholecystectomy rates in the Veterans Affairs (VA) system and in five published studies during the 3 years after the introduction of laparoscopic cholecystectomy. Year 0 is defined as the last year in which laparoscopic cholecystectomy accounted for fewer than 5% of all cholecystectomies.>