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 11-2013. A 4-year-old boy with fever and abdominal pain.

N. Engl. J. Med.. Apr 11, 2013;368(15):1435-44.
Ryan DP, Friedmann AM, Schmitz MD, Ryan RJ.

Department of Pediatric Surgery, Massachusetts General Hospital, Boston, USA.