1. Department of Rheumatology, Ghent University Hospital, Ghent, Belgium;
2. Department of Ophthalmology, Royal Victoria Eye and Ear Hospital, Dublin, Ireland;
3. Department of Clinical Chemistry, Ghent University Hospital, Ghent, Belgium;
4. Department of Ophthalmology, AZ Maria Middelares Hospital, Ghent, Belgium; and
5. Department of Ophthalmology, Ghent University Hospital, Ghent, Belgium.