Affiliation: | 1. Department of Epidemiology & Population Health, Stanford University, Stanford, CA, United States;2. Division of Epidemiology & Biostatistics, University of California, Berkeley, CA, United States;3. Francis I. Proctor Foundation, University of California, San Francisco, San Francisco, CA, United States;4. Department of Ophthalmology, University of California, San Francisco, San Francisco, CA, United States;5. Kaiser Permanente Vaccine Study Center, Oakland, CA, United States |