1. Institute for Medical Research, Jalan Pahang, 50588 Kuala Lumpur, Wilayah Persekutuan, Malaysia
2. Pathology Department, Hospital Raja Permaisuri Bainun, Jalan Hospital, 30990 Ipoh, Perak, Malaysia
3. Ophthalmology Department, Hospital Seri Manjung, 32040 Manjung, Perak, Malaysia
4. Department of Medical Microbiology and Immunology, Universiti Kebangsaan Malaysia Medical Centre, 56000 Kuala Lumpur, Wilayah Persekutuan, Malaysia