aDepartment of Critical Care Medicine, Ghent University Hospital

bDepartment of Internal Medicine and Pediatrics, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium

Correspondence to Jan J. De Waele, Department of Critical Care Medicine, Ghent University Hospital, C. Heymanslaan 10, 9000 Gent, Belgium. Tel: +32 93 32 62 19; fax: +32 93 32 49 95; e-mail: [email protected]