1. From the Tennent Institute of Ophthalmology, Gartnavel General Hospital, Glasgow, Scotland, United Kingdom; and the2Contributed equally to the work and therefore should be considered equivalent senior authors.
2. Contributed equally to the work and therefore should be considered equivalent senior authors.3University Department of Pathology Western Infirmary, Glasgow, Scotland, United Kingdom.
3. From the Tennent Institute of Ophthalmology, Gartnavel General Hospital, Glasgow, Scotland, United Kingdom; and the
4. University Department of Pathology Western Infirmary, Glasgow, Scotland, United Kingdom.