1. Critical Care Medicine Unit, School of Clinical Medicine, The University of Hong Kong, Hong Kong SAR, China.
2. Department of Adult Intensive Care, Queen Mary Hospital, Hong Kong SAR, China.
3. Department of Medicine, The University of Hong Kong, Hong Kong SAR, China.
4. Division of Cardiology, Department of Medicine, The University of Hong Kong-Shenzhen Hospital, Shen Zhen, China.