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

Case records of the Massachusetts General Hospital. Case 4-2013. A 50-year-old man with acute flank pain.

N. Engl. J. Med.. Jan 31, 2013;368(5):466-72.
Greka A, Bhatia RS, Sabir SH, Dekker JP.

Department of Medicine, Massachusetts General Hospital, Boston, USA.