1. Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Safar Center for Resuscitation Research, Children's Hospital of Pittsburgh of UPMC, John G. Rangos Research Center, Pittsburgh, Pennsylvania.
2. Departments of Critical Care Medicine and Environmental and Occupational Health, Safar Center for Resuscitation Research, Children's Hospital of Pittsburgh of UPMC, John G. Rangos Research Center, Pittsburgh, Pennsylvania.