Paper Chase is a research database designed to offer abstracts of research articles published in journals that have a highly rated impact factor as determined by ISI Impact Factor and PageRank. Abstracts are organized by date, with the most recently published papers listed first. 

Paper Chase

Clinical practice. Mammographic screening for breast cancer.

N. Engl. J. Med.. Apr 24, 2003;348(17):1672-80.
Fletcher SW, Elmore JG.

Department of Ambulatory Care and Prevention, Harvard Medical School and Harvard Pilgrim Health Care, Boston 02215, USA.