1. Department of Anaesthesiology and Intensive Care, Faculty of Medicine, Universiti Teknologi MARA , Sungai Buloh Campus, Sungai Buloh 47000, Selangor , Malaysia
2. Department of Cardiovascular and Thoracic Surgery , Faculty of Medicine, , Sungai Buloh Campus, Jalan Hospital, Sungai Buloh 47000, Selangor , Malaysia
3. Universiti Teknologi MARA , Faculty of Medicine, , Sungai Buloh Campus, Jalan Hospital, Sungai Buloh 47000, Selangor , Malaysia