1. Tubal sterilization: focus on the U.S. experience
Carolyn Westhoff, M.D., Anne Davis, M.D. 
Fertility and Sterility 
Volume 73, Issue 5, Pages (May 2000)
DOI: /S (00)

2. Figure 1
Annual number of tubal sterilizations in the U.S. (1–17). National Hospital Discharge Survey, except as noted for 1987 and Procedure codes 66.2–66.3 bilateral destruction or occlusion of fallopian tubes.
Westhoff. Tubal sterilizations. Fertil Steril 2000.
Fertility and Sterility  , DOI: ( /S (00) )