Platelet transfusions for critically ill patients with thrombocytopenia.

Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada; Department of Clinical Pathology, University Health Network, Toronto, ON, Canada; Blood Center of Wisconsin, Milwaukee, WI; Department of Medicine, McMaster University, Hamilton, ON, Canada; Canadian Blood Services, Hamilton, ON, Canada; National Health Service Blood and Transplant/Oxford University Hospitals National Health Service Trust, John Radcliffe Hospital, Oxford, United Kingdom; and Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom