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

The new Sentinel Network--improving the evidence of medical-product safety.

N. Engl. J. Med.. Aug 13, 2009;361(7):645-7.
Platt R, Wilson M, Chan KA, Benner JS, Marchibroda J, McClellan M.

Harvard Medical School and the Harvard Pilgrim Health Care Institute, Boston, USA.