The <scp>N</scp>ational <scp>B</scp>reast and <scp>C</scp>ervical <scp>Cancer E</scp>arly <scp>D</scp>etection <scp>P</scp>rogram: Toward a system of cancer screening in the <scp>U</scp>nited <scp>S</scp>tates
Distribution of the number of citations over years.