1 Department of Ophthalmology, Faculty of Medicine and Health Sciences, Universiti Malaysia Sarawak (UNIMAS), Malaysia. (Tan Aik Kah, Mallika Premsenthil )
2 Department of Ophthalmology, Hospital Umum Sarawak, Kuching, Malaysia. (Asokumaran Thanaraj, Mohamad Aziz Salowi, Intan ak Gudom)