aDivision of Traumatology, Surgical Critical Care, and Emergency Surgery, Department of Surgery

bDivision of Neurocritical Care, Department of Neurology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA

Correspondence to Jose L. Pascual, MD, PhD, FACS, Professor, Department of Surgery, Division of Traumatology, Surgical Critical Care & Emergency Surgery, University of Pennsylvania, 51 N 39th Street, Medical Office Building 1st Floor, Suite 120, Philadelphia, PA 19104, USA. Tel: 215 662 7323; fax: 215 243 2061; e-mail: [email protected]

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