1. Division of Hematology and Stem Cell Transplantation, Department of Medicine, Universiti Kebangsaan Malaysia (UKM), Jalan Yaacob Latif, Bandar Tun Razak, 56000 Kuala Lumpur, Malaysia
2. Division of Neurology, Department of Medicine, Universiti Kebangsaan Malaysia (UKM), Jalan Yaacob Latif, Bandar Tun Razak, 56000 Kuala Lumpur, Malaysia
3. Department of Ophthalmology, Faculty of Medicine, Universiti Kebangsaan Malaysia (UKM), Jalan Yaacob Latif, Bandar Tun Razak, 56000 Kuala Lumpur, Malaysia