[1] UNIV ALBERTA, DEPT OPHTHALMOL, EDMONTON, AB, CANADA
[2] UNIV ALBERTA, DEPT BIOCHEM, EDMONTON, AB, CANADA
[3] UNIV CALGARY, DEPT MED GENET, CALGARY, AB, CANADA
[4] OTTAWA CIVIC HOSP, DEPT OPHTHALMOL, OTTAWA, ON, CANADA
[5] UNIV MEMPHIS, DEPT COMMUNITY MED 11, ST JOHNS, NF, CANADA
[6] CROSS CANC INST, EDMONTON, AB T6G 1Z2, CANADA