Zehr Kenton J
Heart, Lung, and Esophageal Surgery Institute, University of Pittsburgh Medical Center, UPMC/Presbyterian University Hospital, Suite C-700, 200 Lothrop St, Pittsburgh, PA 15213, USA.
Ann Thorac Surg. 2007 Feb;83(2):570-1. doi: 10.1016/j.athoracsur.2006.10.040.