1 The Carter Center Ethiopia, Addis Ababa, Ethiopia; Francis I Proctor Foundation, University of California, San Francisco, CA, USA.
2 Francis I Proctor Foundation, University of California, San Francisco, CA, USA; Department of Epidemiology and Biostatistics, University of California, San Francisco, CA, USA; Department of Ophthalmology, University of California, San Francisco, CA, USA; Institute for Global Health, University of California, San Francisco, CA, USA.
3 Francis I Proctor Foundation, University of California, San Francisco, CA, USA; Department of Ophthalmology, University of California, San Francisco, CA, USA. Electronic address: jeremy.keenan@ucsf.edu.