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

Death in pregnancy--an American tragedy.

N. Engl. J. Med.. Mar 6, 2014;370(10):889-91.
Ecker JL.

From the Department of Obstetrics and Gynecology, Massachusetts General Hospital and Harvard Medical School, Boston.