1 Department of Intensive Care Medicine, Radboud University Medical Center, Radboud Institute for Health Science, Geert Grooteplein Zuid 10, (Internal Post 710) 6525GA, Nijmegen, the Netherlands. Electronic address: Mark.vandenBoogaard@radboudumc.nl.
2 Department of Intensive Care Medicine, Radboud University Medical Center, Radboud Institute for Health Science, Geert Grooteplein Zuid 10, (Internal Post 710) 6525GA, Nijmegen, the Netherlands.