1. Division of Critical Care Medicine, Department of Surgery, Ewha Womans University Mokdong Hospital, Ewha Womans University College of Medicine, Seoul, South Korea
2. Division of Critical Care Medicine, Department of Neurology, Ewha Womans University Seoul Hospital, Ewha Women’s University College of Medicine, Seoul, South Korea
3. Division of Critical Care Medicine, Department of Surgery, Ewha Womans University Seoul Hospital, Ewha Womans University College of Medicine, Seoul, South Korea
4. Division of Critical Care Medicine, Department of Neurology, Ewha Womans University Mokdong Hospital, Ewha Womans University College of Medicine, Seoul, South Korea