1 Neurobiology-Neurodegeneration & Repair Laboratory, National Eye Institute, National Institutes of Health, Bethesda, Maryland.
2 Department of Preventive Medicine, University of Tennessee, Knoxville, Tennessee.
3 Division of Epidemiology and Clinical Applications, National Eye Institute, National Institutes of Health, Bethesda, Maryland.
4 The EMMES Corporation, Rockville, Maryland.
5 Casey Eye Institute, Oregon Health & Science University, Portland, Oregon.
6 Department of Biostatistics, Bioinformatics & Biomathematics, Georgetown University Medical Center, Washington, DC.
7 Division of Epidemiology and Clinical Applications, National Eye Institute, National Institutes of Health, Bethesda, Maryland. Electronic address: echew@nei.nih.gov.