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

Medicare coverage for technological innovations--time for new criteria?

N. Engl. J. Med.. May 20, 2004;350(21):2199-203.
Gillick MR.

Harvard Vanguard Medical Associates and the Department of Ambulatory Care and Prevention, Harvard Pilgrim Health Care and Harvard Medical School, Boston, USA.