1. Department of Internal Medicine, Hospital Sultan Abdul Halim, Kedah, Malaysia
2. Biostatistics and Research Methodology Unit, Hospital USM, School of Medical Sciences, Universiti Sains Malaysia, Kelantan, Malaysia
3. Department of Anaesthesiology and Intensive Care, Hospital Sultan Abdul Halim, Kedah, Malaysia
4. Department of Biostatistics and Research Methodology, School of Medical Sciences, Universiti Sains Malaysia, Kelantan, Malaysia
5. Clinical Research Center, Hospital Sultan Abdul Halim, Kedah, Malaysia
6. Institute of Engineering Mathematics, Universiti Malaysia Perlis, Perlis, Malaysia
7. Centre of Excellence for Advanced Sensor Technology, Universiti Malaysia Perlis, Perlis, Malaysia