1. From the Academic Unit of Ophthalmology, Clinical Sciences South Bristol, Bristol Eye Hospital, Bristol, United Kingdom; the
2. Department of Ophthalmology, Royal College of Surgeons in Ireland, Royal Victoria Eye and Ear Hospital, Dublin, Ireland; the
3. Department of Ophthalmology, University of Aberdeen, Scotland, United Kingdom; and the
4. Department of Pathology and Microbiology, University of Bristol, United Kingdom.