aUniversity of Groningen, Department of Neurology and Neurosurgery, University Medical Center Groningen, Groningen, The Netherlands

bUniversity of Groningen, Department of Anesthesiology, University Medical Center Groningen, Groningen, The Netherlands

cDepartment of Intensive Care, Medical Center Leeuwarden, Leeuwarden

dDutch Transplant Foundation, Leiden, The Netherlands

Correspondence to Gea Drost, MD, PhD, Neurologist and Clinical Neurophysiologist, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700HB Groningen, The Netherlands. Tel: +31 50 361 3968/3612837; fax: +31503611715; e-mail: [email protected]