1 From the *Department of Paediatrics, Khoo Teck Puat-National University Children's Medical Institute, †Department of Otolaryngology-Head and Neck Surgery, ‡Orbit and Oculofacial Surgery, Department of Ophthalmology, National University Health System, Singapore; and §Department of Paediatrics, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.