1. Division of Retina, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, Tennessee
2. Genentech, San Francisco, California
3. Division of Retina, Duke Eye Center, Duke University Hospital, Durham, North Carolina
4. Division of Retina, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland
5. Department of Statistics, Vanderbilt University Medical Center, Nashville, Tennessee