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 6-2013. A 54-year-old man with recurrent diarrhea.

N. Engl. J. Med.. Feb 21, 2013;368(8):757-65.
Simmons LH, Guimaraes AR, Zukerberg LR.

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