1. 1Department of Medicine, University of Texas Southwestern Medical Center, Dallas, Texas;
2. 2Pandemic Response Initiative, Institute for Global Health Sciences, University of California, San Francisco, San Francisco, California;
3. 3Department of Pediatrics, Stanford University, Stanford, California;
4. 6Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas;
5. 4Institute of Tropical Medicine Alexander von Humbolt, Universidad Peruana Cayetano Heredia, Lima, Peru;
6. 5Clinical Trials and Interventions Unit, Ifakara Health Institute, Bagamoyo, Tanzania;
7. 7Department of Pediatrics, University of California, San Francisco, San Francisco, California