Gregory W J Hawryluk1, Giuseppe Citerio2,3, Chiara Robba4. 1. Cleveland Clinic, 762 S. Cleveland-Massillon Rd, Akron, OH, 44333, USA. hawrylg@ccf.org. 2. School of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy. 3. Neuro-Intensive Care, Department of Neurosciences, ASST-Monza, San Gerardo Hospital, Monza, Italy. 4. Anaesthesia and Intensive Care, San Martino Research Hospital, Genoa, Italy.