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

US medical students' health insurance coverage for mental health and substance abuse treatment.

JAMA. Sep 07, 2011;306(9):931-3.
Nardin R, Zallman L, Frank C, Day B, Boyd JW.

Department of Medicine, Cambridge Health Alliance, Cambridge, Massachusetts, USA.