Patrick M Kochanek1, Travis C Jackson2. 1. Department of Critical Care Medicine, University of Pittsburgh School of Medicine, 3550 Terrace Street, Pittsburgh, PA 15261, USA; Safar Center for Resuscitation Research, 3434 Fifth Avenue, Pittsburgh, PA 15260, USA. Electronic address: kochanekpm@ccm.upmc.edu. 2. Department of Critical Care Medicine, University of Pittsburgh School of Medicine, 3550 Terrace Street, Pittsburgh, PA 15261, USA; Safar Center for Resuscitation Research, 3434 Fifth Avenue, Pittsburgh, PA 15260, USA. Electronic address: jacksontc@upmc.edu.