1. Department of Internal Medicine, Hospital Queen Elizabeth, 139, Jalan Penampang, Kota Kinabalu 88200, Sabah, Malaysia
2. Department of Internal Medicine, Hospital Lahad Datu, Peti Bersurat 60065, Lahad Datu 91110, Sabah, Malaysia
3. Department of Internal Medicine, Hospital Sultanah Nora Ismail, Jalan Korma, Taman Soga, Batu Pahat 83000, Johor, Malaysia
4. Neurology Unit, Department of Internal Medicine, Hospital Queen Elizabeth, 139, Jalan Penampang, Kota Kinabalu 88200, Sabah, Malaysia