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

Screening for trisomies in circulating DNA.

N. Engl. J. Med.. Feb 27, 2014;370(9):874-5.
Greene MF, Phimister EG.

From the Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston (M.F.G.).