1 Intensive Care Department, Kalmar Hospital, Kalmar, Sweden; School of Health and Caring Sciences, Linnaeus University, Växjö, Kalmar, Sweden. Electronic address: ingrid.wahlin@ltkalmar.se.
2 Intensive Care Department, Kalmar Hospital, Kalmar, Sweden.
3 Department of Cardiothoracic Surgery, Linköping Hospital, Sweden; Department of Medical and Health Sciences, Linköping University, Sweden.