1 Department of Surgery, Baylor College of Medicine, Houston, Texas, United States of America.
2 Center for Health and Biosciences, James A Baker III Institute of Public Policy, Rice University, Houston, Texas, United States of America.
3 Texas Children's Center for Vaccine Development, Departments of Pediatrics and Molecular Virology and Microbiology, National School of Tropical Medicine, Baylor College of Medicine, Houston, Texas, United States of America.
4 Center for Medical Ethics, and Health Policy, Baylor College of Medicine, Houston, Texas, United States of America.
5 Department of Biology, Baylor University, Waco, Texas, United States of America.
6 Scowcroft Institute of International Affairs, Bush School of Government and Public Policy, Texas A&M University, College Station, Texas, United States of America.