1. Casey Eye Institute, Oregon Health Science University, Department of Ophthalmology 515 SW Campus Drive, Portland, Oregon 97239
2. Departments of Ophthalmology and Visual Sciences and Neurology, University of Iowa Hospitals and Clinics, Hawkins Dr, Iowa City, Iowa 52242
3. Operative Care Division, Veterans Affairs Portland Health Care System, 3710 SW US Veterans Hospital Rd, Portland, OR 97239
4. Sue Anschutz-Rodgers Eye Center, Department of Ophthalmology 1675 Aurora Ct, Aurora, Colorado 80045