1. Faculty of Medicine and Health Science, Universiti Malaysia Sabah (UMS), Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
2. Department of Neurology, Hospital Pengajar Universiti Putra Malaysia, Persiaran Mardi - UPM, 43400 Serdang, Selangor, Malaysia
3. Department of Internal Medicine, Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Jalan Yaacob Latif, 56000 Cheras, Kuala Lumpur, Malaysia