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

Understanding health care as a complex system: the foundation for unintended consequences.

JAMA. Jul 18, 2012;308(3):243-4.
Lipsitz LA.

Hebrew SeniorLife, Beth Israel Deaconess Medical Center, and Harvard Medical School, Boston, Massachusetts 02131, USA. lipsitz@hsl.harvard.edu