1 Centers for Disease Control and Prevention, 1600 Clifton Rd, NE, Atlanta, GA 30333, USA; Task Force for Global Health, 330 W Ponce de Leon Ave, Decatur, GA 30030, USA. Electronic address: jsb6@cdc.gov.
2 Task Force for Global Health, 330 W Ponce de Leon Ave, Decatur, GA 30030, USA.
3 Wake Forest School of Medicine, Bowman Gray Center, 475 Vine St, Winston-Salem, NC 27101, USA.
4 Bill and Melinda Gates Foundation, 440 5th Ave N, Seattle, WA 98109, USA.