1. From the NH&MRC Centre for Clinical Eye Research, Department of Optometry and Vision Science, Flinders Medical Centre and Flinders University of South Australia, Bedford Park, South Australia, Australia;
2. University Eye Clinic of Trieste, Trieste, Italy;
3. University of Ulster, Cathedral Eye Clinic, York Street, Belfast, United Kingdom; and 4Mater Hospital, Belfast Health and Social Care Trust, Crumlin Road, Belfast, United Kingdom.