Department of Critical Care Medicine, Faculty of Medicine and Dentistry, University of Alberta and Alberta Health Services, Edmonton, Alberta, Canada

Correspondence to Sean M. Bagshaw, MD, MSc, FRCPC, Department of Critical Care Medicine, Faculty of Medicine and Dentistry, University of Alberta, 2-124E Clinical Sciences Building, 8440-112 St NW, Edmonton, AB T6G2B7, Canada. Tel: +1 587 984 4662; fax: +1 780 492 1500; e-mail: [email protected]