1. Department of Internal Medicine, Hospital Lahad Datu, Peti Bersurat 60065, 91110, Lahad Datu, Sabah, Malaysia
2. Neurology Unit, Department of Internal Medicine, Hospital Queen Elizabeth, 88200, Kota Kinabalu, Sabah, Malaysia
3. Department of Internal Medicine, Hospital Sultanah Nora Ismail, Jalan Korma, Taman Soga, 83000, Batu Pahat, Johor, Malaysia
4. Department of Internal Medicine, Hospital Queen Elizabeth, 88200, Kota Kinabalu, Sabah, Malaysia